Adium is described as 'Free and open source instant messaging application for Mac OS X, written using Mac OS Xs Cocoa API, released under the GNU GPL and developed by the Adium team. Based on the libpurple protocol library, Adium can connect you to any number of messaging accounts on any' and is a very popular instant messenger in the social & communications category. There are more than 50 alternatives to Adium for a variety of platforms, including Linux, Mac, Windows, Android and BSD apps. The best Adium alternative is Element. It's not free, so if you're looking for a free alternative, you could try Element or Pidgin. Other great apps like Adium are Element X, HexChat, Trillian and Messenger.
Technitium Mesh is a secure, anonymous, peer-to-peer (p2p), open source instant messenger designed to provide end-to-end encryption. Primary aim of developing this instant messenger is to provide privacy which is achieved using cryptography and anonymity using Tor network.
Instantbird is an instant messaging client based on Mozilla XULRunner and the open source library libpurple created by the software developers of Pidgin . Over 250 add-ons allow user customization of, and addition of, features.
Tencent QQ, generally referred to as QQ, is the most popular free instant messaging computer program in Mainland China, and has over 856.2 million users. In April 2010, QQ.com ranked 10th overall in Alexas internet rankings.
KakaoTalk is a phone number based messenger service that allows users anywhere in the world to chat one-to-one or in a group for free. (no SMS service)
Zoho Cliq simplifies your team communication with organized conversations, information that's easy to find and by connecting to the tools you love. Transform ideas into reality with your team. With channels, your team communication is visible, transparent and efficient.
BeagleIM is a lightweight and powerful XMPP client developed by Tigase, Inc. It provides an easy way to start using the XMPP Protocol (formerly known as Jabber) if you've never used it before. Veterans of the protocol will find many features here they are familiar.
qutIM - free open-source multiprotocol ( ICQ, Jabber/GTalk/Ya.Online/LiveJournal.com, Mail.Ru, IRC )
Brosix is a secure communication tool for businesses that need a functional way to organize their internal communication.
Brosix is the most popular commercial alternative to Adium.
Conduit is a simple, fast and reliable chat server powered by Matrix. Conduit is an alternative to Synapse and tries to be lightweight and easy to install, but it is still in development.
Stack is an Internet launchpad that increases the efficiency of working with the web for the average internet user by allowing simultaneous use of multiple web apps within a neatly organized working environment.
Kadu is an open source Jabber/XMPP and Gadu-Gadu instant messenger client for Linux, *BSD, Mac and Windows.
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