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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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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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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iPod Ripping

Senuti

Get music off of your iPod.
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iPodDisk

Copy music off your iPod in the finder, like a regular disk drive.
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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.app

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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Portable Apps