Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.

Empathy is an instant messaging (IM) and voice over IP (VoIP) client which supports text, voice, video, file transfers, and inter-application communication ov…

IM+ supports simultaneously major IM services, including Google Talk, Twitter DMs, Yahoo!, AIM/iChat, ICQ, Jabber (and Slack through Jabber), etc.

Miranda IM is an open source multiprotocol instant messaging application, designed for Microsoft Windows.

Rambox is a free and Open Source messaging and emailing app that combines common web applications into one.

YakYak is a desktop chat client for Google Hangouts.

Disa is your new messaging hub. Conversations from different services can seamlessly be joined together, or disbanded within seconds.

GroupMe is a mobile group messaging app.

Kopete is a multi-protocol, free software instant messaging client released as part of the KDE Software Compilation. Although it can run in numerous environme…

qutIM is free and open-source multiprotocol (ICQ, Jabber, Mail.Ru, IRC, VKontakte) instant messenger.

Station is an opensource app aggregator and browser.