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iJab is an Ajax-based web based instant messaging program for XMPP/Jabber. It is free software
tweet.IM is a free service offered by ProcessOne. It enables you to use micro-blogging platforms like Twitter from your existing instant messaging application. The service makes it easier for you to send messages (called tweets), as well as follow the tweets of other users.
Jake is a collaborative file sharing tool that allows you to securely and easily share files on your computer with other people.