Gajim

The goal of Gajim is to provide a full featured and easy to use Jabber client. Gajim works nicely with GNOME, but does not require it to run. It is released under the GNU General Public License.

FEATURES:

• Tabbed chat window
• Group chat support (with MUC protocol)
• Emoticons, Avatars, File transfer, Room Bookmarks
• Metacontacts Support
• Trayicon, Speller, extented chat history functionalities
• TLS and GPG support (with SSL legacy support)
• Transport Registration support
• Service Discovery including Nodes
• Wikipedia, dictionary and search engine lookup
• Multiple accounts support
• DBus Capabilities. Read more information
• XML Console

Homepage: http://www.gajim.org

Pidgin

Pidgin is an instant messaging program for Windows, Linux, BSD, and other Unixes. You can talk to your friends using AIM, ICQ, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr.

Pidgin can log in to multiple accounts on multiple IM networks simultaneously. This means that you can be chatting with friends on AIM, talking to a friend on Yahoo Messenger, and sitting in an IRC channel all at the same time.

Homepage: http://www.pidgin.im

Miranda

Miranda IM is a multi-protocol instant messaging client for Windows. Very light on system resources and extremely fast, Miranda IM requires no installation and can be made to fit on a single floppy disk or USB drive. Featuring a powerful plugin-based framework and boasting over 350 plugins, Miranda IM is one of the most flexible and customisable messaging clients on the planet.

Homepage: http://www.miranda-im.org

Spark

Spark is an Open Source, cross-platform IM client optimized for businesses and organizations. It features built-in support for group chat, telephony integration, and strong security. It also offers a great end-user experience with features like in-line spell checking, group chat room bookmarks, and tabbed conversations.

Homepage: http://www.igniterealtime.org

Jabbin

Jabbin is an Open Source instant messaging program that allows free PC to PC calls using the VoIP system over the Jabber network. The new Release 2.0 use the libjingle protocol.

Homepage: http://sourceforge.net/projects/jabbin/

Ekiga

Ekiga (formely known as GnomeMeeting) is an open source VoIP and video conferencing application for GNOME. Ekiga uses both the H.323 and SIP protocols. It supports many audio and video codecs, and is interoperable with other SIP compliant software and also with Microsoft NetMeeting.

Homepage: http://www.ekiga.org

Super Tux Kart

SuperTuxKart is a Free 3D kart racing game, with many tracks, characters, and items for you to try. Have fun!

Homepage: http://supertuxkart.sourceforge.net

Pencil

Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Pencil is free and open source.

Homepage: http://www.les-stooges.org

Pirates: Battle for Caribbean

Attack enemy ships, earn gold, upgrade your fort, buy new weapons become Ultimate Captain.

Homepage: http://www.gametop.com

VariCAD

VariCAD is a 3D/2D CAD system for mechanical engineering. In addition to standard tools for 3D modeling and 2D drafting, the CAD system provides tools for shells, pipelines, sheet metal unbending and crash tests, assembly support, libraries of standard mechanical parts (ANSI, DIN) and symbols, mechanical part calculations and tools for working with bills of materials (BOM) and title blocks. VariCAD supports STEP, STL, IGES, DWG and DXF file formats.

The comprehensive CAD software enables designers to quickly create, evaluate, and modify their models. It is compact, fast, easy to use, and provides everything one needs for mechanical design. The CAD system is sold "fully loaded", including all features and functions, for one affordable price.

Homepage: http://www.varicad.com

Avidemux

Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. It supports many file types, including AVI, DVD compatible MPEG files, MP4 and ASF, using a variety of codecs. Tasks can be automated using projects, job queue and powerful scripting capabilities.

Homepage: http://avidemux.sourceforge.net

Sauerbraten

Sauerbraten is a free multiplayer/singleplayer first person shooter, built as a major redesign of the Cube FPS. Much like the original Cube, the aim of this game is not necessarily to produce the most features & eyecandy possible, but rather to allow map/geometry editing to be done dynamically in-game, to create fun gameplay and an elegant engine. The engine supporting the game is entirely original in code & design, and its code is Open Source (ZLIB license, read the docs for more on how you can use the engine). In addition to the FPS game which is in a very playable state, the engine is being used for an RPG which is in the preproduction phase. Additionally, Proper Games ltd are the first to use the engine commercially. dot3 labs is a company started by the creators of sauerbraten that offers commercial support.

Homepage: http://www.sauerbraten.org