IM+

Slick is a messenger application for mobile devices. It allows you to chat with your friends connected though various online messaging applications. Currently it is still in development, an alpha …

Spark is an Open Source, cross-platform IM client optimized for businesses and organizations. It features built-in support for group chat, telephony integration, and strong security. It also offers a great...

Sim-IM is a multiple protocol instant messenger for MS Windows, GNU/Linux, FreeBSD. Sim-IM supports Jabber/XMPP, Google Talk, ICQ and AIM (Oscar), Yahoo! Messenger and Microsoft Messenger (MSN) protocols....

Empathy is a messaging program which supports text, voice, and video chat and file transfers over many different protocols. You can tell it about your accounts on all those services …

ShMessenger Mobile is a free instant messaging client for mobile phones, which supports YMSG (Yahoo!), MSN and GTalk protocols. In just a few minutes, you can chat with your friends …

Mercury Messenger or simply "MM" (formerly called dMSN) is a Windows Live Messenger network Instant Messaging client developed in Java. It supports almost all of the features in Windows Live …

KMess is the Live Messenger alternative for Linux, aiming at integration with the KDE desktop environment. With KMess, chatting with friends using Live Messenger has never been so good. Features: …

Digsby is a multiprotocol IM client that lets you chat with all your friends on AIM, MSN, Yahoo, ICQ, Google Talk, and Jabber with one simple to manage buddy list. …

Subway is a web-based IRC client with a multi-user backend and a JavaScript-heavy UI. Frontend/backend communication is done with websockets (or best available fallback where not available). The backend...

Meebo is integrated, all-in-one instant messaging (IM client) that connects you with your friends everywhere. It supports a large number of popular servicesand connects you to MSN, Yahoo, AOL/AIM, MySpace, …

WeChat is the complete mobile communication and private social networking app. Free, cross-platform, and full-featured, WeChat is the best way to keep in touch with everyone you care about. Features …

Meebo for the Desktop. It uses Adobe® AIR™ to place meebo home page on the desktop in its own window.

Tkabber is a Free and Open Source client for the Jabber instant messaging system. Its writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS …

A beautiful, free, easy-to-use chat (instant messaging) application for the XMPP protocol (Jabber, Google Talk). Project has been discontinued, though source code is still available on website