Open Source Windows

Web Browsing

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  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.

Video Player, BitTorrent, Podcasting

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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.

IM - Instant Messaging

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  Pidgin

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

Video Converter- MP4, iPhone, Android

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  Miro Video Converter

  Convert any type of video to mp4 or theora. Convert any video for use with iPhone, iPod, Android, etc. Very clean, easy to use interface.

Download helpers

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  SkipScreen

  A Firefox extension that skips unnecessary clicks and wait times on Rapidshare, Megaupload, Mediafire, zShare, and more.

E-mail

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  Mozilla Thunderbird

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

RSS

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  RSSOwl

  Solid cross-platform RSS client.

Peer-to-Peer Filesharing

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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.

Video Playback

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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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  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.

Word Processing / Office Suites

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  LibreOffice

  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.

Podcasting

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  Juice

  Solid podcasting client.

Financial Transactions

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  Bitcoin

  A "peer-to-peer" digital currency so you can buy things without paying transaction fees.
  

Sound Recording

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  Audacity

  Simple sound recording tool.

Graphics / Photo Editing

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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.

FTP / SFTP

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  Filezilla

  Solid podcasting client.

IRC

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  X-Chat 2

  IRC client.

Archiving

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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.