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Thunderbird is a great email client from the same people who brought you the Firefox browser.
Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.

• Tabbed email
• An Archive feature similar to the one in GMail
• Lightning fast search
• Smart folders

Pidgin is a chat program which lets you log in to accounts on multiple chat networks simultaneously. This means that you can be chatting with friends on MSN, talking to a friend on Google Talk, and sitting in a Yahoo chat room all at the same time.
Pidgin runs on Windows, Linux, and other UNIX operating systems.
Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. It can support many more with plugins.
Pidgin supports many features of these chat networks, such as file transfers, away messages, buddy icons, custom smilies, and typing notifications. Numerous plugins also extend Pidgin's functionality above and beyond the standard features.
Pidgin integrates with the system tray on Windows.

The Google Talk downloadable application for Windows offers many features for communicating with your friends and family.
Instant messaging — Chat with all of your Google Talk and Gmail contacts in real time.
Free PC-to-PC voice chat — You can talk to anyone else for free who's online and has the Google Talk client.
Send and receive voicemails — If the person you're calling isn't available, you can leave a voicemail.
Unlimited file transfers — Send files to your contacts. There are no file size or bandwidth restrictions.
Gmail notifications on your desktop — When you're signed into Google Talk, you'll be notified of new messages in your Gmail inbox.

The AIM® service is all about helping you keep in touch with your buddies. Whether you're sending IMs, sharing photos or doing a voice chat we want to make it better.
Features include:

• Sleek new design: New buttons, new layout, new color, new brand! Tell us what you think of our shiny gold look and the new layout.
• Profiles, profiles, profiles: Connect with your buddies like never before. Customize your profile, get updates from other social networks, and more. Now, you'll never miss an update on AIM.
• Status messages in the IM.
• :) Emoticons: You asked, we answered.
• AIM Blast: IM your friends, coworkers, or customers all at once, and all from the convenience of your Buddy List.
• More goodies: Sign in as invisible, Ctrl + F to search your Buddy List, Search the web from the IM window. 

Vuze (formerly Azureus) is a free BitTorrent client used to transfer files via the BitTorrent protocol. Vuze is written in Java, and uses the Azureus Engine. Vuze offers multiple torrent downloads, queuing/priority systems (on torrents and files), start/stop seeding options and instant access to numerous pieces of information about your torrents.
In addition to bittorrenting, Vuze allows you to view, publish and share original DVD and HD quality video content. You can see content through channels and categories containing TV shows, music videos, movies, video games and others.
If you publish your own original content through Vuze, you can charge for it and make money.
Please note: You must have Java installed to be able to run Vuze.