Video scaling effect

Con Kolivas has released a very interesting varient of rzip, called lrzip, which can use multiple compressor backends and achieve even better compression Authors The original author of rzip is Andrew Tridgell. Version 2 of rzip also contains a lot of work from Paul Russell. Download You can download the latest release from the download directory. For the bleeding edge, you can fetch rzip via CVS or rsync.

rtf2latex2e is a program that translates RTF (rich text format) files into LaTeX files. It has the capability to handle fairly complex RTF files containing figures, tables, and equations. The resulting LaTeX files are intended to be quite readable and suitable for editing.

RIG is a program I wrote to replace a particularly poor closed-source unattributed public-domain implementation for MS-DOS. Essentially it gathers random selections of first and last names, location data, and street names, to assemble a fake name and address, complete with geographically consistant ZIP code, area code, state, and city name. My implementation of fake is GPL, however its database belongs to whoever wrote the original implementation, or if that person remains unknown then I suppose it lies in the public domain. If you feel uncomfortable with this then please provide a new database. It shouldn't be too hard to create a new one.

remctl is a client/server application that supports remote execution of specific commands, using Kerberos GSS-API for authentication and confidentiality. Which commands a given user can execute is controlled by a configuration file and ACL files and can be easily tightly limited, unlike with rsh. The mapping of command to backend program is done by the configuration file, which allows some additional flexibility compared to ssh command restrictions and works with Kerberos authentications rather than being limited to public key authentications.

Documentation for RCS is available online, as is documentation for most GNU software.

Solaris, SunOS, NetBSD, FreeBSD, Linux, Fedora, Redhat, OSPF, BGP, ATM, Juniper, Cisco.

PyQt is a set of Python v2 and v3 bindings for The Qt Company's Qt application framework and runs on all platforms supported by Qt including Windows, OS X, Linux, iOS and Android. PyQt5 supports Qt v5. PyQt4 supports Qt v4 and will build against Qt v5. The bindings are implemented as a set of Python modules and contain over 1,000 classes.

PyLucene is a Python extension for accessing Java LuceneTM. Its goal is to allow you to use Lucene's text indexing and searching capabilities from Python. It is API compatible with the latest version of Java Lucene, version 4.10.1 as of October 6th, 2014.

pyexiv2 is a python binding to exiv2, the C++ library for manipulation of EXIF, IPTC and XMP image metadata. It is a python module that allows your python scripts to read and write metadata (EXIF, IPTC, XMP, previews) embedded in image files (JPEG, TIFF, ...).

Putmail website

Ping Tunnel For those times when everything else is blocked. By Daniel Stødle, daniels@cs.uit.no Last updated: 5. September 2011 Contents What is it? Features and requirements How it works Download Using ptunnel Changes License What is it? Ptunnel is an application that allows you to reliably tunnel TCP connections to a remote host using ICMP echo request and reply packets, commonly known as ping requests and replies. At first glance, this might seem like a rather useless thing to do, but it can actually come in handy in some cases. The following example illustrates the main motivation in creating ptunnel: Setting: You're on the go, and stumble across an open wireless network. The network gives you an IP address, but won't let you send TCP or UDP packets out to the rest of the internet, for instance to check your mail.

pstree is a utility which displays running processes in a hierachy. It is useful for examining from whence a process was started.

Proxytunnel Project Homepage, punching holes in the corporate firewall

ProGuard is the most popular optimizer for Java bytecode.

Potrace is built from sources using the standard configure/make commands. Please see the file INSTALL for generic installation instructions, and the file README for compile time configuration options specific to Potrace. Some pre-compiled binary distributions are also available. See the file README for instructions on how to install Potrace from a binary distribution. Additional instructions for Windows users are contained in the file README-WIN. If you would like to ensure the accuracy of the downloaded files, you can double-check their SHA1 sums. Source distribution: potrace-1.14.tar.gz Precompiled distributions: Windows (64 bit) potrace-1.14.win64.zip potrace-1.14.win64.tar.gz Windows (32 bit) potrace-1.14.win32.zip potrace-1.14.win32.tar.gz Mac OS X (64 bit) potrace-1.14.mac-x86_64.tar.gz Mac OS X (32 bit) potrace-1.14.mac-i386.tar.gz Linux (64 bit) potrace-1.14.linux-x86_64.tar.gz Linux (32 bit) potrace-1.14.linux-i386.tar.gz Sun Solaris (Sparc) potrace-1.14.solaris-sparc.tar.gz Sun Solaris (x86_64) potrace-1.13.solaris2.11-x86_64.tar.gz(1) Sun Solaris (i386) potrace-1.13.solaris2.11-i386.tar.gz(1) FreeBSD (x86_64) potrace-1.13.freebsd10-x86_64.tar.gz(2) NetBSD (x86_64) potrace-1.13.netbsd7-x86_64.tar.gz(2) OpenBSD (x86_64) potrace-1.13.openbsd58-x86_64.tar.gz(2) Minix (i386) potrace-1.14.minix-i386.tar.gz Linux (Sparc64) potrace-1.13.linux-sparc64.tar.gz(2) Linux (Alpha) potrace-1.11.linux-alpha.tar.gz(2) AIX potrace-1.10.aix-rs6000.tar.gz AROS (i386) potrace-1.9.aros-i386.zip potrace-1.9.aros-i386.tar.gz(3) Packages: Solaris Package potrace-1.14.pkg.gz(1) Redhat Source RPM potrace-1.14-1.src.rpm Redhat Binary RPM (x86_64) potrace-1.14-1.x86_64.rpm Amiga (OS4) potrace.lha (version 1.14)(5) Package Management: Debian and Ubuntu apt-get install potrace(4) SuSE potrace(6) Fedora yum install potrace(7) ArchLinux pacman -S potrace(8) FreeBSD pkg_add -r potrace(9) Fink (Mac OS X) fink install potrace(10) Macports (Mac OS X) port install potrace(11) NixOS nix-env -i potrace(12) (1) Solaris-i386 and x86_64 binaries and packages provided by Apostolos Syropoulos <asyropoulos at gmail.com>. (2) Linux for Alpha and Sparc64, FreeBSD, NetBSD, and OpenBSD binaries provided by Nelson Beebe <beebe@math.utah.edu>. (3) AROS binaries supplied by Matthias Rustler <mrustler at gmx.de>. See the AROS archives for sources and updates. (4) Debian i386 Package maintained by Bartosz Fenski <fenio at debian.org>. Debian has centralized package management and users should run "sudo apt-get install potrace" to install. (5) Amiga Package provided by Guillaume Boesel <guillaume at boesel.fr>. See the OS4 Depot for updates. (6) SuSE RPMs provided by Stanislav Brabec <sbrabec at suse.cz>. Potrace appears in the official SuSE distribution. (7) Fedora package maintained by Susi Lehtola <jussilehtola at fedoraproject.org>. Potrace is available on all Fedora branches.

Podiff is available for download from this location.

Pngcrush is an optimizer for PNG (Portable Network Graphics) files. It can be run from a commandline in an MSDOS window, or from a UNIX or LINUX commandline.

Pngnq is a tool for quantizing PNG images in RGBA format.

timeLoop timeLoop is a system daemon that will run cron jobs that were missed because the computer was asleep / shutdown. No configuration needed! Download (v0.2.1) (OS X Installer package) (57.00 K) (digital hashes) Licensed under the Open Software License version 2.0 Download Source Code (C source) (56.01 K) (digital hashes) Last updated: October 20, 2005 rmtrash rmtrash is a small utility that will move the file to OS X's Trash rather than obliterating the file (as rm does). Download (v0.3.3) (OS X) (6.04 K) (digital hashes) Download Source Code (Obj-C source) (2.31 K) (digital hashes) Last updated: January 18, 2005 pidof pidof is a utility to display the PID number for a given process name Download (0.1.4) (OS X) (4.56 K) (digital hashes) Download Source Code (C source) (2.04 K) (digital hashes) Last updated: January 18, 2005 xstat xstat is a tool to display various status items for a given file.

pHash is an open source software library released under the GPLv3 license that implements several perceptual hashing algorithms, and provides a C-like API to use those functions in your own programs. pHash itself is written in C++. pHash was created by Evan Klinger.

The Osh Project provides two ports of the original /bin/sh from Sixth Edition (V6) UNIX (circa 1975). I, J.A. Neitzel, develop and maintain this project. I sign releases with the detached signature declared on my Signature Key page.

Mirror of Apache Orc

Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but is also intended for storage and streaming applications.

Open Source Computerized Adaptive Testing System

OpenDBX is an extremely lightweight but extensible database access library written in C. It provides an abstraction layer to all supported databases with a single, clean and simple interface that leads to an elegant code design automatically.

nuttcp is a network performance measurement tool intended for use by network and system managers. Its most basic usage is to determine the raw TCP (or UDP) network layer throughput by transferring memory buffers from a source system across an interconnecting network to a destination system, either transferring data for a specified time interval, or alternatively transferring a specified number of bytes. In addition to reporting the achieved network throughput in Mbps, nuttcp also provides additional useful information related to the data transfer such as user, system, and wall-clock time, transmitter and receiver CPU utilization, and loss percentage (for UDP transfers).

NSD is an authoritative only, high performance, simple and open source name server. The latest current stable release is NSD 4.1.2. Download the latest version.

From:  Werner Koch <wk-AT-gnupg.org> To:  gnupg-announce-AT-gnupg.org Subject:  nPth - The New GNU Portable Threads Library Date:  Tue, 08 May 2012 12:39:49 +0200 Message-ID:  <87zk9j2byi.fsf@vigenere.g10code.de> Cc:  marcus.brinkmann-AT-rub.de Archive-link:  Article, Thread Hi! We are pleased to announce the first tarball release of the New GNU Portable Threads Library: nPth version 0.90. nPth is a non-preemptive threads implementation using an API very similar to the one known from GNU Pth. It has been designed as a replacement of GNU Pth for non-ancient operating systems. In contrast to GNU Pth is is based on the system's standard threads implementation. Thus nPth allows the use of libraries which are not compatible to GNU Pth. GNU Pth is often used to provide a co-routine based framework. GnuPG-2 makes heavy use of this concept for good audibility, general security concerns, and ease of implementation. However, GNU Pth has the drawback that ugly hacks are required to work with libraries which are not GNU Pth aware. The nPth tarball and its signature are available as ftp://ftp.gnupg.org/gcrypt/npth/npth-0.90.tar.bz2 ftp://ftp.gnupg.org/gcrypt/npth/npth-0.90.tar.bz2.sig and at all GnuPG mirrors. See the included README file and the npth.h header for documentation. Bug reports and requests for help should be send to the gnupg-devel mailing list at gnupg.org. nPth is available under the terms of the LGPLv3+ or the GPLv2+. The GIT repository is at git://git.gnupg.org/npth.git . The current development version of GnuPG (2.1) has already been migrated to nPth and thus the next beta release will require it. Obviously we expect to fix some portability problems before we can release 1.0. On common Linux and kFreeBSD systems and even on Android, nPth should build and work fine. Background: When porting GnuPG-2 to Windows in 2004, we had the need for a replacement of GNU Pth, which is not available for native Windows. We came up with an emulation based on the native Windows thread system. Experience since then showed that such an emulation is a solid way to provide a co-routine based framework. Given that thread implementations (in particular pthreads) are now in common use on all platforms, there is not must justification left for not using them: Without considering the GnuPG packages, Debian has only two packages requiring GNU Pth (zhcon and jabberd14 - the latter even seems not in wide use anymore). Many thanks to Ralf S. Engelschall for his excellent GNU PTH library, which served GnuPG very well for many years. Happy hacking, Marcus and Werner -- Die Gedanken sind frei. Ausnahmen regelt ein Bundesgesetz.

Nrg2Iso is a linux utils for converting CD (or DVD) image generated by Nero Burning Rom to ISO format.

News for ngspice circuit simulator

Nickle is a programming language based prototyping environment with powerful programming and scripting capabilities. Nickle supports a variety of datatypes, especially arbitrary precision numbers. The programming language vaguely resembles C. Some things in C which do not translate easily are different, some design choices have been made differently, and a very few features are simply missing.

mpegdemux is an MPEG1/MPEG2 system stream demultiplexer. It can be used to list the contents of an MPEG system stream and to extract elementary streams.

Negfix8 is a very simple yet powerful script which can be used to turn scanned negative image into the positive image.

NAnt is a free .NET build tool. In theory it is kind of like make without make's wrinkles. In practice it's a lot like Ant.

Open-source DNS Benchmark Utility

Mussh is a shell script that allows you to execute a command or script over ssh on multiple hosts with one command. When possible mussh will use ssh-agent and RSA/DSA keys to minimize the need to enter your password more than once.

msitools is a set of programs to inspect and build Windows Installer (.MSI) files. It is based on libmsi, a portable library to read and write .MSI files. libmsi in turn is a port of (and a subset of) Wine's implementation of the Windows Installer.

Mp3blaster is an mp3 player for computers running a UNIX-like operating system, e.g. Linux, Free/Net/OpenBSD, etc. Its interface is entirely text based, thereby eliminating the need for a graphical environment like X-Windows.

Check mp3 files for errors and list their properties.

moreutils is a growing collection of the unix tools that nobody thought to write long ago when unix was young.

The official web page for the Modules software package. The Modules package provides for the dynamic modification of a user's environment via modulefiles.

GNU Moe is a powerful, 8-bit clean, console text editor for ISO-8859 and ASCII character encodings. It has a modeless, user-friendly interface, online help, multiple windows, unlimited undo/redo capability, unlimited line length, global search/replace (on all buffers at once), block operations, automatic indentation, word wrapping, file name completion, directory browser, duplicate removal from prompt histories, delimiter matching, text conversion from/to UTF-8, romanization, etc.

An API to easily mock any system or service you integrate with via HTTP or HTTPS from either Java or JavaScript.

Homepage for MJPEG support under Linux

minidjvu is a command line utility which encodes and decodes single page black-and-white DjVu files, and can compress multiple pages, taking advantage from similarities between pages. The Windows version is supplied with a minimal GUI (a JavaScript-based web page which can run as an application with Internet Explorer).

Minicom is a menu driven communications program. It emulates ANSI and VT102 terminals. It has a dialing directory and auto zmodem download.

A GPL-licensed userspace utility to test for faulty RAM or memory subsystem, with source code.

Andrea Fabrizi's security blog

Cucumber. Simple, Human Collaboration

Hgflow is a Mercurial extension that implements Driessen's model. It supplies users high level stream-based commands for managing branches. The original implementation was inspired by git-flow - an earlier implementation for the git version control system. Many commands and usages in hgflow are similar to git-flow. Experience learned in using gitflow can be directly transferred to hgflow. An excellent introduction to usage of git-flow can be found at here.

JFlex is a lexical analyzer generator (also known as scanner generator) for Java, written in Java.

GeoGit is an open source tool that draws inspiration from Git, but adapts its core concepts to handle distributed versioning of geospatial data.

Gearman provides a generic application framework to farm out work to other machines or processes that are better suited to do the work. It allows you to do work in parallel, to load balance processing, and to call functions between languages. It can be used in a variety of applications, from high-availability web sites to the transport of database replication events. In other words, it is the nervous system for how distributed processing communicates.

Graphical Disk Map download. Graphical Disk Map 2013-04-29 15:55:47 free download. Graphical Disk Map Tool to inspect the used space of folders. Files are displayed in a cushioned tree map. Useful if you wonder where all your free space went to.

GConf is a system for storing application preferences.

FreeXL is an open source library to extract valid data from within an Excel (.xls) spreadsheet.FreeXL design goals: to be simple and lightweight to be stable, robust and efficient to be easily and universally portable completely ignoring any GUI-related oddity Note that the final goal means that FreeXL ignores at all fonts, sizes and alignments, and most formats. It ignores Pivot Table, Charts, Formulas, Visual Basic macros and so on. FreeXL is structurally simple and quite light-weight (typically 40-80K of object code, stripped).

FreeIPMI FreeIPMI provides in-band and out-of-band IPMI software based on the IPMI v1.5/2.0 specification. The IPMI specification defines a set of interfaces for platform management and is implemented by a number vendors for system management. The features of IPMI that most users will be interested in are sensor monitoring, system event monitoring, power control, and serial-over-LAN (SOL). The FreeIPMI tools and libraries listed below should provide users with the ability to access and utilize these and many other features. A number of useful features for large HPC or cluster environments have also been implemented into FreeIPMI. See the README or FAQ for more info. The FreeIPMI project currently includes the following tools and libraries: Project Tools Bmc-info A tool to read information about a BMC such as device version numbers, device support, and globally unique IDs (guids). (example output) Bmc-watchdog A tool/daemon to manage a BMC Watchdog. This tool is typically used for system timeout management and automatic system restarts in the event of a system crash. Ipmi-chassis A tool to manage/monitor a chassis, such as chassis power, identification (i.e. LED control), and status. Ipmi-fru A tool to read field replaceable unit (FRU) information from a motherboard/machine. (example output) Ipmi-sel A tool to read and manage IPMI System Event Log (SEL) records. SEL records store system event information and may be useful for debugging problems. (example output, example output w/ event state) Ipmi-sensors A tool to read IPMI sensor readings and sensor data repository (SDR) information. (example output, example output w/ sensor state) Ipmipower A tool for remote power control. Ipmiconsole A tool for Serial-over-Lan (SOL) console access. Ipmi-config A tool to configure BMC and IPMI information. In can be used to configured usernames, passwords, networking information, security, Serial-over-LAN (SOL), Platform Event Filtering (PEF), boot devices, power restoration policy, sensor thresholds, sensor events, and many more configuration options. (example core config, PEF config, Chassis config, Sensors config) Ipmi-raw A tool that provides hex input/output of IPMI commands. Ipmi-locate A tool that can probe for information about a BMC device, such as device addresses or IPMI version support. (example output) Ipmi-pet A tool to parse and interpret Platform Event Traps (PET). Ipmi-dcmi A tool to perform Data Center Manageability Interface (DCMI) IPMI extension commands. Supports extensions for asset management and power usage management. Bmc-device A tool to perform advanced BMC commands, such as resetting the BMC, configuring ACPI, configuring SDR/SEL time, manually generating events, re-arming sensors, and configuring manufacturer settings. Ipmiping An IPMI ping tool for debugging. (example output) Rmcpping A RMCP ping tool for debugging. (example output) Ipmi-oem An IPMI tool for OEM specific commands. Ipmidetect/Ipmidetectd A tool and daemon for IPMI node detection. Ipmiseld A daemon that regularly polls the SEL and stores the events to the local syslog. Project Libraries Libfreeipmi A C library that includes KCS, SSIF, and OpenIPMI Linux, and Solaris BMC drivers, IPMI 1.5 and IPMI 2.0 LAN communication interfaces, IPMI packet building utilities, IPMI command utilities, and utilities for reading/interpreting/managing IPMI. Libipmiconsole A library for Serial-over-Lan (SOL) console access. SOL console access is abstracted into a file descriptor interface, so users may read and write console data through a file descriptor. Libipmimonitoring A library for sensor monitoring and interpretation. Sensor monitoring and interpretation of those sensors is abstracted into an API with an iterator interface. Libipmidetect A library for IPMI node detection.

finite-state compiler and C library

fmscripts - Using FileMerge as a diff command

A free, open source codec for lossless audio compression and decompression

“Hurra FlawFinder ! FlawFinder is the greatest software of the World.

A fast, free C FFT library; includes real-complex, multidimensional, and parallel transforms. Benchmarked against many other FFTs.

FCrackZip is a free and fast zip password cracker

Fetchmail is a full-featured, robust, well-documented remote-mail retrieval and forwarding utility intended to be used over on-demand TCP/IP links (such as SLIP or PPP connections). It supports every remote-mail protocol now in use on the Internet: POP2, POP3, RPOP, APOP, KPOP, all flavors of IMAP, ETRN, and ODMR. It can even support IPv6 and IPSEC.

Fail2ban scans log files (e.g. /var/log/apache/error_log) and bans IPs that show the malicious signs -- too many password failures, seeking for exploits, etc. Generally Fail2Ban is then used to update firewall rules to reject the IP addresses for a specified amount of time, although any arbitrary other action (e.g. sending an email) could also be configured. Out of the box Fail2Ban comes with filters for various services (apache, courier, ssh, etc).

Fabric is a Python (2.5-2.7) library and command-line tool for streamlining the use of SSH for application deployment or systems administration tasks.

Exempi is an implementation of XMP. Version 2.x is based on Adobe XMP SDK and released under a BSD-style license like Adobe's. The 3 clause BSD (aka New-BSD) license is compatible with GPL. The licensing is kept identical in order to allow two-way merging of the code (ie sending our change to the XMP SDK to Adobe for integration).

exercism is a command line tool to interact with exercism.io.

esniper is a lightweight console application for sniping eBay auctions.

GNU Enscript is a free replacement for Adobe's enscript program.

Embryo is a tiny library designed to interpret limited Small programs compiled by the included compiler, embryo_cc. It is mostly a cleaned up and smaller version of the original Small abstract machine. The compiler is mostly untouched.

EJDB is the C library based on modified version of Tokyo Cabinet.

Portable Common Lisp implementation

David Anderson's DWARF Page

dvdbackup is a tool to rip video DVDs from the command line. It has the advantages of being small, fast, and easy to use.

DVDAuthor is a set of tools to help you author the file and directory structure of a DVD-Video disc, including programmatic commands for implementing interactive behaviour. It is driven by command lines and XML control files, though there are other programs that provide GUI-based front ends if you prefer (see below).

Dropbear is a relatively small SSH server and client. It runs on a variety of POSIX-based platforms. Dropbear is open source software, distributed under a MIT-style license.

Source code documentation and analysis tool

DigiTemp is a simple to use program for reading values from 1-wire devices. Its main use is for reading temperature sensors, but it also reads counters, and understands the 1-wire hubs with devices on different branches of the network. DigiTemp now supports the following 1-wire temperature sensors: DS18S20 (and DS1820), DS18B20, DS1822, the DS2438 Smart Battery Monitor, DS2422 and DS2423 Counters, DS2409 MicroLAN Coupler (used in 1-wire hubs), and the AAG TAI-8540 humidity sensor.

dfu-programmer is a Device Firmware Update based USB programmer for Atmel chips with a USB bootloader.

Deis is an open source PaaS that leverages Docker, CoreOS and Heroku Buildpacks to provide a private application platform that is lightweight and flexible.

Ever wanted to get rid of Outlook ? DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client (e.g. Thunderbird with Lightning or Apple iCal) with an Exchange server, even from the internet or behind a firewall through Outlook Web Access. DavMail now includes an LDAP gateway to Exchange global address book and user personal contacts to allow recipient address completion in mail compose window and full calendar support with attendees free/busy display.

Datomic is designed from the ground up to run on AWS. Datomic leverages AWS technology, including DynamoDB, S3, EFS, and CloudFormation to provide a fully integrated solution. Datomic provides elastic scaling, encryption at rest, VPC isolation, and a usage-based pricing model. Datomic also utilizes AWS-native technologies for monitoring and logging (CloudWatch), as well as deployment (CloudFormation), providing fully-integrated operation and management from within the AWS Console.

Dante is a product developed by Inferno Nettverk A/S. It consists of a SOCKS server and a SOCKS client, implementing RFC 1928 and related standards. It is a flexible product that can be used to provide convenient and secure network connectivity.

Darcs is a free and open source, cross-platform version control system, like git, mercurial or subversion but with a very different approach. Thanks to its focus on changes rather than snapshots, Darcs can offer a freer way of working, and a simpler user interface.

csync is a file synchronizer especially designed for you, the normal user.

free C++ library for cryptography: includes ciphers, message authentication codes, one-way hash functions, public-key cryptosystems, key agreement schemes, and deflate compression

Crunch is a wordlist generator where you can specify a standard character set or a character set you specify. crunch can generate all possible combinations and permutations.

CppUnit is the C++ port of the famous JUnit framework for unit testing. Test output is in XML for automatic testing and GUI based for supervised tests.

What is CppCMS? CppCMS is a Free High Performance Web Development Framework (not a CMS) aimed at Rapid Web Application Development.

Please remember that development of Coreutils is a volunteer effort, and you can also contribute to its development. For information about contributing to the GNU Project, please read How to help GNU.

The Perl script colordiff is a wrapper for 'diff' and produces the same output but with pretty 'syntax' highlighting. Colour schemes can be customized.

Clutter is an open source (LGPL 2.1) software library for creating fast, compelling, portable, and dynamic graphical user interfaces. It is a core part of Gnome3, it is used by the GnomeShell, and is supported by the open source community.

Create powerful and efficient JavaScript.

OpenMP/Clang: An implementation of the OpenMP(R) C/C++ language extensions in Clang/LLVM compiler

ClamAV is the open source standard for mail gateway scanning software.

Chromaprint is the core component of the AcoustID project. It's a client-side library that implements a custom algorithm for extracting fingerprints from any audio source.