[Shahryar_NEO]

Last From http://www.opensourcewindows.org/ :

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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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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Audacity is my favorite software that you can record any sound from you speaker easy and professionally !