RecordMyDesktop is a free and open source desktop screencasting software application written for GNU/Linux.

MyNotex is useful to manage textual notes gathered by subject. It allows search, import/export and synchronization.

Jolicloud is a Linux-based operating system based on Ubuntu Linux, but is tweaked for netbooks and other computers with limited disk storage, memory, and screen size.

KMess is a client to connect to the Microsoft MSN network, allowing you to chat with Windows Live Messenger users. It supports fast file transfers, display pictures, custom emoticons, and more.

xmonad is a tiling window manager for X11 offering stable and fast tiling. xmonad is customisable with a large extension library and offers extensive documentation for support and hacking.

GHC is a state-of-the-art, open source, compiler and interactive environment for the Haskell programming language.

Deluge is a lightweight cross-platform BitTorrent client. Full-featured, it uses libtorrent in it’s backend and PyGTK for it’s user interface.

Aptana Studio’s community edition is the free, open source Web development environment optimized for use with Ajax libraries and scripting languages like JavaScript, Ruby and PHP. Aptana Studio is considered by many devleopers the best-in-class authoring environment for today’s more rich and interactive Web pages and Ajax applications.

NVU is a Web Authoring System for Linux, Windows and Mac that rivals programs like FrontPage and Dreamweaver. Nvu (which stands for “new view”) allows you to manage and create web pages with no technical expertise or knowledge of HTML.

Kino is a non-linear DV editor for GNU/Linux. It features excellent integration with IEEE-1394 for capture, VTR control, and recording back to the camera. It captures video to disk in Raw DV and AVI format, in both type-1 DV and type-2 DV (separate audio stream) encodings.

Greenstone is a suite of software for building and distributing digital library collections. It is not a digital library but a tool for building digital libraries. It provides a new way of organizing information and publishing it on the Internet or on CD-ROM in the form of a fully-searchable, metadata-driven digital library.

Koha is the first open-source Integrated Library System (ILS). In use worldwide, its development is steered by a growing community of libraries collaborating to achieve their technology goals. Koha’s impressive feature set continues to evolve and expand to meet the needs of its user base.

Xara Xtreme for Linux is a powerful, general purpose graphics program for Unix platforms including Linux, FreeBSD and (in development) OS-X.

Stellarium is a free open source planetarium for your computer that shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. It is being used in planetarium projectors.

Celestia is the free space simulation that lets you explore our universe in three dimensions.Celestia is expandable, seamless and covers over 100, 000 stars.

Electric Sheep is a screen saver run by thousands of people all over the world, it communicates with other computers via the internet to share in creating morphing abstract animations known as “sheep”.

The Battle for Wesnoth is a turn-based strategy game with a fantasy theme. Fight a desperate battle to reclaim the throne of Wesnoth, or take hand in any number of other adventures.

Open Yahtzee is an open-source version of the classic dice game Yahtzee. It is built to work across many different operating systems and platforms.

Sauerbraten (a.k.a. Cube 2) is a free multiplayer/singleplayer FPS, built as a major redesign of the Cube FPS. The aim of this game is to allow map/geometry editing to be done dynamically in-game, to create fun gameplay and an elegant engine

Nexuiz focuses on bringing the FPS genre back to the basics with quick, lethal battles and balanced weaponry. As of the current release there are 9 weapons and 24 official maps, as well as 15 player models, with an average of 2 skins each.

Tremulous blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans. Players on both teams are able to build working structures in-game like an RTS.

LinCity-NG is a 3D City building Simulation Game for Linux-based operating systems. It is a polished and improved version of the classic LinCity game.

FlightGear is an open-source, multi-platform, cooperative flight simulator project featuring 20, 000 real world airports, correct runway markings and placements, world scenary, accurate terrain and more.

KompoZer is a complete web authoring system that combines web file management and easy-to-use WYSIWYG web page editing.

Amaya is a Web editor/Browser, i.e. a tool used to create and update documents directly on the Web. Browsing features are seamlessly integrated with the editing and remote access features in a uniform environment. This follows the original vision of the Web as a space for collaboration and not just a one-way publishing medium.

WikkaWiki is a flexible, standards compliant and lightweight wiki engine written in PHP, which uses MySQL to store pages. Designed for speed, extensibility, and security.

Haiku is currently in development and aims to be a free operating system that provides users of all levels with a personal computing experience that is simple yet powerful, and free of any unnecessary complexities.