Web Browsing

Mozilla Firefox

The premier free, open-source browser. Tabs, pop-up blocking, themes, and extensions. Considered by many to be the world's best browser.
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IM - Instant Messaging

Gaim

Connect to multiple IM accounts simultaneously in a single app, including: AOL IM, MSN, and Jabber.
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Email

Mozilla Thunderbird

Powerful spam filtering, solid interface, and all the features you need.
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RSS

FeedReader

Simple, lightweight aggregator.
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RSSOwl

Solid cross-platform RSS client.
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Internet TV / Video Podcasting

Democracy Player

Subscribe to internet TV channels (video RSS feeds), download and watch all in one app. Built-in Channel Guide and torrent support.
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Peer-to-Peer Filesharing

Cabos

A simple, easy to use filesharing program. Gnutella network.
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Gnucleus

A very good Gnutella search and download filesharing program.
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BitTorrent

Download large files from multiple people simultaneously.
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Azureus

A more complicated BitTorrent client. So many features you'll lose your mind.
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Players And Ripping Softwares

Video Playback

Media Player Classic

Compact, but powerful media player. Plays anything under the sun. No install necessary.
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VLC

Plays more video files than most players: Quicktime, AVI, DIVX, OGG, and more. Pretty good interface.
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MPlayer

Similar to VLC-- plays loads of video formats.
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DVD Ripping / Video Conversion

Media Coder

Great tool for ripping CDs, DVDs, etc and converting between tons of video formats.
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Word Processing / Office Suites

OpenOffice.org

Big, full featured suite of tools for word processing and spreadsheets. Compatible with and a free replacement for Microsoft Word documents. Also supports OpenDocument Format.
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AbiWord

A word processor. Leaner and quicker than OpenOffice. Compatible with Microsoft Word documents and OpenDocument Format.
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Multimedia Tools

Podcasting

Juice

Solid podcasting client.
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DVD Ripping

Handbrake

DVD to MPEG-4 ripper/converter.
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Sound Recording

Audacity

Simple sound recording tool.
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Graphics / Photo Editing

GIMPShop

Photo editing application that rivals Photoshop in features.
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Paint.net

Graphics editor with a very nice interface.
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Inkscape

Vector graphics application.
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FTP / SFTP

Filezilla

Excellent FTP program.
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IRC

X-Chat 2

IRC client.
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Developer tools

SharpDevelop

Open Source IDE for the .NET Framework. Utilizes the multiple programming languages and Windows forms
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Notepad ++

Open Source programmers notepad for Windows
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CodeBlocks

Open Source C++ IDE for Windows, can use the Visual Studiops Toolkit 2003 or MingW
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Note Taking

Freemind

An innovative application for note taking and outlining. Takes time to get used to, but some people swear by it.
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Jarnal

Open Source note taking application written in Java
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Keynote

Open Source note taking application, very good. I use this myself extensively
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Personal Finance

TurboCASH

Simple, easy to use application for managing personal finances.
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Quasar

Easy to use Accounting package
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Chat Clients

AMSN

MSN Messenger client written in TCL/TK AMSN Messenger

X-Chat

IRC Client X-Chat

More Web Browsing

KMeleon

Fast, nice web browser.
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Amaya Browser for Windows

W3C developed web browser and editor for multiple platforms
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Screensaver

Electric Sheep

Immersive, trippy screensaver.
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More Filesharing

Gnucleus

Download torrents. Nice and simple.
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Also see: Poisoned - Azureus

3D Graphics and Modeling

Blender

Powerful 3D Modeling software.
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Jahshaka

The worlds first OpenSource Realtime Editing and Effects System.
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Also see: Persistence of Vision Raytracer,Quesa

Stars and Outer Space

Celestia

Open-source 3D planetarium software. Akin to traveling through space (outer space).
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Stellarium

"Renders realistic skys in realtime." See what you would see if your city wasn't so light-polluted. Used in real planetariums.
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Also see: macORSA - Orbit Reconstruction, Simulation, and Analysis

Games

Marathon: Aleph One

Engine for Bungie's free FPS series Marathon. Play online, solo play with rich original story, many total conversions and thousands of maps.
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Zombies

3D zombie strategy game.
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Armagetron Advanced

3D Tron game.
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BZFlag

First-person tank game.
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Battle for Wesnoth

Fantasy / Strategy Game
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Also see: Snes9X (SNES emulator), Frozen Bubble

Free File Hosting

CC Publisher

Host Creative Commons video or audio files for free on archive.org with this easy uploader.
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Security Tools

NMap

Easy to use port scanner for Windows
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Ethereal

Network Protocol Analyzer
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TrueCrypt

Creates encrypted virtual hard drives for extra security
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ClamWin

Open Source Anti-Virus. Very good at detecting viruses. Can be plugged into hMailServer for e-mail protection LIMITATION: Real Time scanning not implemented yet
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Eraser

Delete files securely off your hard drive utilizing DoD standards
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MP3 and Audio Tools

MP3 Gain

Easy to use MP3 manipulation tool for Windows. adjusts sound levels on MP3's so they are all the same
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MP3 Book Helper

This program provides rapid Mp3 (ID3v1, ID3v2) and Ogg/Speex/Flac Vorbis tags editing and file renaming functions. Mass Tag editing is done using special variables and Regular Expressions.
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musikCube

Open Source MP3 Player, ripper and organizer written using the .NET Framework
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