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NOTE : This list is not sorted by importance, All application have their own importance and charm. I hope you enjoy Open Source software.
If you need a software for a specific use and do not seem to find it here, you can request it here.

VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, ... and almost any other format you may come accross) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.

Audacity allows users to record live audio, convert tapes and records to digital formats, or mix pre-existing digital audio tracks. Supported formats include Ogg Vorbis, MP3, and WAV sound files.

Attractive interface. Plays any video type. Subscribe to video RSS, download, and watch all in one. Torrent support. Search and download from YouTube and others video sharing sites and save it on your computer. Download video podcast from natural geographic, comedy central, ask a ninja and thousands more including High definition podcasts.

AssaultCube, formerly ActionCube, is a free first-person-shooter based on the game Cube. Set in a realistic looking environment, as far as that´s possible with this engine, while gameplay stays fast and arcade. This game is all about team oriented multiplayer fun.

19mb	AssaultCube is provided as a 19mb package of pure fun.
56k	Thanks to the efficient networking code, AssaultCube requires very little bandwith, you can play it with a 56k modem internet connection.
OSS	Like its origin Cube, AssaultCube comes with full source code, available under a zlib like OpenSource license.
edit	Create new maps (virtual worlds) together with other people online. The cooperative editmode makes it possible..

PeerGuardian works by blocking and logging all TCP/IP connections to and from known IP ranges used by known P2P foes, such as the RIAA, MPAA, MediaForce, MediaDefender, BaySTP, Ranger, OverPeer, NetPD, and more. PeerGuardian is a powerful, yet small firewall program that was especially designed for P2P users who want to protect their computers from unauthorized searches instigated by private agencies and corporations. To make sure that the block-list used to block malicious connections is up to date; PeerGuardian uses an on-line block-list Database that is continuously updated on a daily basis -- so your privacy will remain safe while swapping files. PeerGuardian is compatible with all TCP/IP based file sharing applications, such as Kazaa, iMesh, LimeWire, eMule, Grokster, DC+...

Don`t under-estimate this sleek fast and compact graphics expert. GIMP offers full alpha channel support, controls for layers and channels, editable text layers, transformation tools including rotate, scale, shear and flip. GIMP can make just about any kind of graphics file format there is. Supported formats include: bmp, gif, jpeg, pdf, png, ps, psd, svg, tiff, tga, xpm, and so many others I just got tired of typing. The GIMP has a number of selection tools including rectangle, ellipse, free, fuzzy and intelligent. And it has an advanced path tool doing bezier and polygonal selections, so its easy to draw straight lines, rectangles, or even twisty curves.

The GIMP is massively extensible. It has over 100 readily-available plug-ins which allow for the easy addition of new file formats and new effect filters. And the number of available brushes, gradients, and other add-ons make the GIMP extremely customizable. Even most of the popular Adobe Photoshop brushes and add-ons also work with GIMP.

You should read the Gimp documentations for help.

The award-winning Web browser from Mozilla is now faster, even more secure, and totally customizable to your online life.We've upgraded the Add-ons Web site, so now it's easier than ever to personalize your Web browser and make it your own. Firefox 2 delivers helpful new features to make your online experience more productive.Firefox continues to lead the way in online security, and now includes active protection from online scams to keep you safer.

This is one program every user should have. It is has a sleek & simple GUI, and works extremely fast. Cabos is Gnutella file sharing program based on LimeWire and Acquisition.Cabos provides simple sidebar user interface, firewall to firewall transfers, proxy transfers, Universal Plug and Play, iTunes + iPod integration, "What's New?" searches, international searches, and more.

Transmission has been built from the ground up to be a lightweight yet powerful BitTorrent client. Its simple, intuitive interface is designed to integrate tightly with whatever computing environment you choose to use. Transmission strikes a balance between providing useful functionality without feature bloat.

Thunderbird 2 features many new enhancements to help you better manage your unruly inbox, and stay informed. Thunderbird 2 scales to the most sophisticated organizational needs while making it easy to find what you need.Mozilla has bolstered Thunderbird’s acclaimed security and privacy measures to ensure that your communications and identity remain safe. It’s like having your own security guard online.Thunderbird allows you to customize your email to suit your specific needs whether it’s how you search and find messages or listening to music right out of your inbox.

Adium is a free instant messaging application for Mac OS X, released under the GNU GPL and developed by the Adium team. With Adium, you can connect to any number of messaging accounts on any combination of supported messaging services and then chat with other people using those services. Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.

OpenOffice.org is a multiplatform and multilingual office suite and an open-source project. Compatible with all other major office suites. It contains an extensive spreadsheet, word processor, presentation, database software. In addition to that it can also solve scientific formulas and equations, edit drwaings, flowcharts and logos.

THIS WEBSITE IS CREATED WITH NVU.

Finally! A complete Web Authoring System for Linux desktop users as well as Microsoft Windows and Macintosh users to rival programs like FrontPage and Dreamweaver. Nvu (which stands for "new view") makes managing a web site a snap. Now anyone can create web pages and manage a website with no technical expertise or knowledge of HTML. WYSIWYG editing of pages, making web creation as easy as typing a letter with your word processor. Integrated file management via FTP. Simply login to your web site and navigate through your files, editing web pages on the fly, directly from your site.Reliable HTML code creation that will work with all of today's most popular browsers. Jump between WYSIWYG Editing Mode and HTML using tabs. Tabbed editing to make working on multiple pages a snap. Powerful support for forms, tables, and templates.

Looking at the filesize you may not believe what this application is capable of, dont be fooled by the quickness of this application, the features wont let you down.

What would you say to a free, open-source 3D program that had almost everything you could find in those expensive professional applications that cost hundreds, even thousands of dollars? It may sound too good to be true, but Blender 3D delivers amazing power at an unbeatable price.

Blender combines 3D modeling, rendering, animation, video sequencing, and game development in one application. It is also available on every major platform, meaning Mac, Windows, and Linux users can all work and play together with exactly the same tools.

Blender may be open-source, but it is incredibly rich with features. As with professional commercial products like Final Cut Pro, Photoshop, and Dreamweaver, there is a learning curve with such powerful software. A new user should not expect to be creating his first feature-length animation without spending significant time developing skills. Fortunately for everyone, Blender has an active user community that creates tutorials and helps everyone with answers and troubleshooting.

Blender is not for the faint of heart. Learning to use it is time-consuming and best done by following the detailed tutorials available on the Blender Web site. There is also an extensive online Blender community, making familiarization with the app less painful--if not pain-free. However, none of these detracts from the overall experience or usefulness of the program, and we strongly recommend it for advanced users.


Features

Explore our universe in glorious 3D with this free application.

This program doesn't feature Carl Sagan, but it does have the billions and billions of stars about which he waxed poetic--and you can experience them all from the comfort of your desk chair.

Celestia is a free real-time space simulation that lets you experience our universe in three dimensions. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy.

All travel in Celestia is seamless; the exponential zoom feature lets you explore space across a huge range of scales, from galaxy clusters down to spacecraft only a few meters across. 

A 'point-and-go-to' interface makes it simple to navigate through the universe to the object you want to visit

Unlike most planetarium software, Celestia doesn't confine you to the surface of the Earth.