Instant Messenger
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Pidgin
Pidgin - Open Source Chat Client
Open Source Communication Software
Pidgin is an open-source multi-platform instant messaging client. 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.
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Miranda IM
Miranda IM - an Open Source IM
Miranda IM - Open Source Instant Messenger
Miranda IM is a fast and lightweight open source Instant Messenger client for Microsoft Windows. It supports various protocols and it’s fairly easy to use and configure. Miranda IM uses very little memory and is extremely fast. It requires no installation
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Instantbird
Instantbird
Open source Instant messenger
Instantbird is a cross-platform instant messaging client (IM Client) based on Mozilla's XULRunner and the open source library libpurple used in Pidgin. Instantbird is free software available under the GNU General Public License. Instantbird open source client can used 250 add-ons; allowing user to customize their messaging experience.
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Adium
Adium - IM Client for Mac
Open Source Instant messaging Client
Adium is a open source instant messaging client for Mac OS X that supports multiple IM networks, including Windows Live Messenger, Yahoo! Messenger, Google Talk, AIM, ICQ, XMPP and OTR. It supports many protocols through the libraries libezv (for Bonjour), MGTwitterEngine (for Twitter), and libpurple (for all other protocols). It is written using Mac OS X's Cocoa API, and it is released under the GNU General Public License and many other licenses for components that are distributed with Adium.
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Spark
Spark - Open Source IM
Open Source IM Client
Spark is a secure, fast, Open Source, cross-platform IM client optimized for businesses and organizations. It features built-in support for group chat, telephony integration, and powerful security. It also offers a outstanding end-user experience with features like in-line spell checking, group chat room bookmarks, and tabbed conversations.
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