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 end-user experience with features like in-line spell checking, group chat room bookmarks, and tabbed conversations.
Tkabber is a Free and Open Source client for the Jabber instant messaging system. Its writen in Tcl/Tk, and works on many plat ...
KakaoTalk is a phone number based messenger service that allows users anywhere in the world to chat one-to-one or in a group f ...
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full end-to-end encryption that supports prot ...
Unified Messaging is awesome! Disa is your new messaging hub. Conversations from different services can seamlessly be joined t ...
Miranda IM is the smaller, faster, easier instant messenger with support for multiple protocols. Designed from the ground-up t ...
The goal of Gajim is to provide a full featured and easy to use Jabber client. Gajim works nicely with GNOME, but does not req ...
A simple & beautiful app for Facebook Messenger. Chat without distractions on any Operating System.
Chat everywhere! IM+ is the most widely used mobile IM app! Connect all-in-one to MSN, Yahoo!, Google Talk, AIM, Jabber, ICQ, ...
Adium is a free and open source instant messaging application for Mac OS X, written using Mac OS Xs Cocoa API, released under ...
Pidgin is an easy to use, multi-protocol chat client client used by millions. Connect to AIM, MSN, Yahoo, XMPP, and more chat ...
Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You c ...
Trillian is an instant messaging app that works on phones, tablets, and desktops while keeping your chats neatly synchronized ...
Psi is an instant messaging application for Windows, Linux, and Mac OS X that connects to the free, open XMPP network. Localiz ...
Ayttm is an instant messaging (aka chat) client that provides all-in-one chat functionality for several major instant messagin ...