Open source Instant messaging for Windows


The goal of Gajim is to provide a full featured and easy to use Jabber client. (GPL)

Linux - FreeBSD - Windows


HexChat is an IRC client based on XChat, but unlike XChat it’s completely free for both Windows and Unix-like systems. (GPL)

Linux - Windows - MAC OS X


With Instantbird, we intend to redefine the way instant messaging is used, so that it works the way you want. Both simple and powerful, it will help you manage all your real time communications. (GPL)

Linux - Windows - MAC OS X


Jitsi (formerly SIP Communicator) is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, AIM/ICQ, Windows Live, Yahoo! and many other useful features. (Apache)


Miranda IM

Miranda IM is an open-source multi protocol instant messenger client for Microsoft Windows. (GPL)



Pidgin is a multi-protocol Instant Messaging client that allows you to use all of your IM accounts at once. (GPL)

Linux - FreeBSD - Windows


Spark is an Open Source, cross-platform IM client optimized for businesses and organizations. (GPL)

Linux - Windows - MAC OS X

7 applications