Internet
Mozilla Firefox
Mozilla Firefox is a web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation.
Website: http://www.mozilla.com/firefox
Pidgin
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.
Website - http://www.pidgin.im/
RSSOwl
RSSOwl lets you gather, organize, update, and store information from any compliant source in a convenient, easy to use interface, save selected information in various formats for offline viewing and sharing, and much more
Website: http://www.rssowl.org
Azureus
Azureus is a BitTorrent client written in Java.
Website: http://azureus.sourceforge.net
Gnucleus
Gnucleus was the beginning of a few open-source Gnutella related projects (GWebCache, GnucDNA, GnucNS). Gnucleus itself is a Windows application for accessing the Gnutella and G2 networks. One of the first released after the introduction of Gnutella in 2000 by Nullsoft. It is also the first client to fully support the G2 network, the future of open protocol P2P. The latest builds of Gnucleus can be found on the download page and also through the auto-update system inside the program. Currently most of the development effort is going into the GnucDNA (the core of Gnucleus) rather than the Gnucleus interface itself.
Website: http://www.gnucleus.com/Gnucleus/
Filezilla
FileZilla is a cross-platform graphical FTP, FTPS and SFTP client a lot of features, supporting Windows, Linux, Mac OS X and more
Website: http://sourceforge.net/projects/filezilla/
aMSN
is a free open source MSN Messenger clone.
Website: http://amsn.sourceforge.net/
K-Meleon
K-Meleon is an extremely fast, customizable, lightweight web browser based on the Gecko layout engine developed by Mozilla which is also used by Firefox. K-Meleon is free, open source software released under the GNU General Public License and is designed specifically for Microsoft Windows (Win32) operating systems.
Website: http://kmeleon.sourceforge.net/
Kompozer
KompoZer is a complete web authoring system that combines web file management and easy-to-use WYSIWYG web page editing.
Website: http://kompozer.net/
Evolution
Evolution provides integrated mail, addressbook and calendaring functionality to users of the GNOME desktop.
Website: http://projects.gnome.org/evolution/
Google Chrome
Google Chrome is a browser that combines a minimal design with sophisticated technology to make the web faster, safer and easier.
Website: http://www.google.com/chrome