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Python programming language
[1662 users on Ohloh]
Python is a dynamic, object-oriented programming language that can be used for many kinds of software development. It offers strong support for integration with other languages and tools, comes with extensive standard libraries, and can be learned in a few days. Many Python programmers report substantial productivity gains and feel the language encourages the development of better code.
[665 users on Ohloh]
Ruby is the interpreted scripting language for quick and easy object-oriented programming. It has many features to process text files and to do system management tasks (as in Perl). It is simple, straight-forward, extensible, and portable.
[451 users on Ohloh]
FFmpeg is a complete solution to record, convert and stream audio and video. It includes libavcodec, the leading audio/video codec library. FFmpeg is developed under Linux, but it can compiled under most operating systems, including Windows.
[223 users on Ohloh]
Qt is a cross-platform application and UI framework. Using Qt, you can write applications once and deploy them across many desktop and embedded operating systems without rewriting the source code.
[176 users on Ohloh]
FreeMind is Mind-Mapping tool and an intuitive editor for tree-structured data. It features a modular design, and can be used to edit any kind of data, dependent on the current mode. The data is represented as a Mind-Map, while data, behavior, node style, edge style, color, etc. are determined by the mode. It features one-click fold, unfold, and "follow link" operations.
[154 users on Ohloh]
KTorrent is a light and full-featured bittorrent program. It supports:
- µTorrent compatible peer exchange
- Zeroconf extension to find peers on the local network
- WebGUI plugin
- RSS plugin
- Grouping feature to put torrents into groups
- UDP Trackers
- Port forwarding with UPnP
- IP blocking plugin
- Importing of partially or fully downloaded files
KDElibs (KDE)
[145 users on Ohloh]
The KDE libraries, basis of KDE and used by many open source projects. They are based on Qt, Trolltech's cross-platform toolkit, and run on Linux, BSDs, and other Unices, as well as Microsoft Windows and Mac OS X.

Licensed under GNU LGPL, they may be used by open source and proprietary applications.

[111 users on Ohloh]
ScummVM is a program which allows you to run certain classic graphical point-and-click adventure games, provided you already have their data files. The clever part about this: ScummVM just replaces the executables shipped with the game, allowing you to play them on systems for which they were never designed!

ScummVM lets you run these adventures: Adventure Soft's Simon the Sorcerer 1 and 2; Revolution's Beneath A Steel Sky, Broken Sword 1 and Broken Sword 2; Flight of the Amazon Queen; Wyr...

[81 users on Ohloh]
Erlang is a programming language designed at the Ericsson Computer Science Laboratory. Ericsson released the entire source code of the Erlang system including extensive libraries of code for building robust fault-tolerant distributed applications.
[78 users on Ohloh]
KOffice is a free, integrated office suite for KDE, the K Desktop Environment. KOffice applications uses OpenDocument as their native file format when possible. The suite is released separately from KDE.

The KOffice suite includes the following applications:
- KWord - A frame-based word processor
- KSpread - A powerful spreadsheet application
- KPresenter - A full-featured presentation program
- Kexi - An environment for creating data...

[74 users on Ohloh]
MythTV is a home-brew PVR project. It's been under heavy development for seven years, and is now usable and full featured.
[52 users on Ohloh]
DownThemAll (or just dTa) is a powerful yet easy-to-use Mozilla Firefox extension that adds new advanced download capabilities to your browser.
DownThemAll lets you download all the links or images contained in a webpage and much more: you can refine your downloads by fully customizable criteria to get only what you really want.
DownThemAll is all you can desire from a download manager: it features an advanced accelerator that increases speed up to 400%, it allows you...
[48 users on Ohloh]
Pygame is a set of Python modules designed for writing games. It is written on top of the excellent SDL library. This allows you to create fully featured games and multimedia programs in the python language. Pygame is highly portable and runs on nearly every platform and operating system.
[43 users on Ohloh]
OpenAL is a cross-platform 3D audio API appropriate for use with gaming applications and many other types of audio applications.
Boo Programming Language
[41 users on Ohloh]
A wrist-friendly language targeting the Common Language Runtime (.NET / Mono) with an extensible compiler pipeline, a syntax reminiscent of Python, and many other features (like type inference, syntactic macros, etc.)
[41 users on Ohloh]
Deluge is a full-featured BitTorrent client for Linux, Mac OS X and Windows. It uses libtorrent in it's backend and PyGTK for it's user interface.

Deluge features a rich plugin collection; in fact, most of Deluge's functionality is available in the form of plugins.

Deluge was created with the intention of being lightweight and unobtrusive. It is our belief that downloading shouldn't be the primary task on your computer and therefore shouldn’t monopolize system resources.


[35 users on Ohloh]
Gendarme is a extensible rule-based tool to find problems in .NET applications and libraries. Gendarme inspects programs and libraries that contain code in ECMA CIL format (Mono and .NET) and looks for common problems with the code, problems that compiler do not typically check or have not historically checked.

Gendarme uses the Cecil library to introspect code.

[35 users on Ohloh]
OpenSimulator is a Second Life-compatible open source region simulator. Its companion project, OpenGridServices, provides the infrastructure for setting up a grid of simulators.
Trinity Core
[35 users on Ohloh]
An opensource MMORPG framework that allows connections from WOW client. Written in C++ and using Mysql as its DB. Forked from Mangos and kept in sync to some degree.
CLISP - an ANSI Common Lisp
[34 users on Ohloh]
GNU CLISP is an ANSI Common Lisp implementation with an interpreter, compiler, debugger, object system (CLOS, MOP), sockets, fast bignums, arbitrary precision floats, and foreign language interface which runs on most UNIXes and Win32.