Open Source Windows

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

miro
Beautiful interface. Plays any video type (much more than windows media player). Subscribe to video RSS, download, and watch all in one. Torrent support. Search and download from YouTube and others.
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IM - Instant Messaging

Pidgin
Connect to multiple IM accounts simultaneously in a single app, including: AOL IM, MSN, and Jabber.
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E-mail

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

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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azureus
A powerful, but complicated BitTorrent client. So many features you'll lose your mind.
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Video Playback

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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Media Player Classic
Compact, but powerful media player. Plays anything under the sun. No install necessary.
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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

GIMP
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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