Open Sources Applications for WinXp

Free and open-source software is good for you and for the world. This is the best Windows software that we know of.
No adware, no spyware, just good software.
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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Video Player / Video Podcasting

Democracy Player

Beautiful interface. Plays any video file. Subscribe to video RSS feeds, download and watch all in one app. Torrent support. Search and download from YouTube and other sites.
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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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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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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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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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BloodShed Software

Open Source tools for development. Includes Dev-C++ 5 beta, Dev-C++ 4 CD version, Dev-C++ 4.01 update, Dev-C++ for Linux,Dev-Pascal, QuickInstall 2.0, Avi Creator 1.0, Dev-C++ 4 sources, Dev-Pascal 1.9 sources, Multibox 4.0, Fast Cleaner 1.0, LaserWar, LaserWar sources for Delphi, Calc-By-Step 1.0, Dev-C++ Packages.
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Dia for Windows

Dia is a Visio type clone for Windows and UNIX/Linux systems. It has many templates included and very useful for flowcharting etc.
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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
Download Page 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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Utorrent

Download torrents.
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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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Mapping Tools

Nasa World Wind

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