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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ScITE

Source code Editor for Windows and X
Nerladdnings Sida Web Developer Server Suite Very good WAMP Stack (Windows, Apache, MySQL, PHP) Very thouroughly tested on Windows Server 2003 and Windows 2000 Server (preliminary testing on Longhorn Server underway). Highly Recommended
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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

Frostwire

GNUTella client based on the Limewire codebase
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3D Graphics and Modeling

Blender

Powerful 3D Modeling software.
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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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Wireshark

Network Protocol Analyzer, formerly called Ethereal
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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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Mapping Tools

Nasa World Wind

Mapping tool similar to Google Earth for Windows. Must have the .NET Framework installed

Windows Vista Readiness

Many Questions have arisen about the readiness of this software for Windows Vista. As of right now, no support for Vista is planned. As testing is conducted I will inform you of Vista readiness and what works and what doesnt. Thank You

Windows open source program