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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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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Pidgin

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

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

Solid cross-platform RSS client.
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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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VLC

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

Great tool for ripping CDs, DVDs, etc and converting between tons of video formats.
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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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Juice

Solid podcasting client.
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Handbrake

DVD to MPEG-4 ripper/converter.
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Audacity

Simple sound recording tool.
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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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Filezilla

Excellent FTP program.
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X-Chat 2

IRC client.
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PeaZip

Fantastic archiving utility to extract and pack archives of an extensive amount of formats. PeaZip also features password protecting archives, keyfile support, system integration, a lovely interface, and much more.
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