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Mozilla Thunderbird

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

A powerful, but complicated BitTorrent client. So many features you'll lose your mind.
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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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Media Player Classic

Compact, but powerful media player. Plays anything under the sun. No install necessary.
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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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GIMP

Photo editing application that rivals Photoshop in features.
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