Freemium

Skype is an instant messaging and VOIP (Voice Over Internet Protocol) client to communicate with people in a distant place.

Adium

Open Source

Adium is an Open source multi-protocol instant messaging client for Mac OS X, supports MSN, Jabber, Yahoo! and other networks.

Jitsi

Open Source

Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application.

Empathy

Open Source

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

Psi

Open Source

Psi is a free instant messaging application designed for the XMPP network (including Google Talk). Fast and lightweight, Psi is fully open-source and compatib…

ChatSecure

Open Source

ChatSecure is a messaging application for iOS which allows OTR and OMEMO encryption for the XMPP protocol.

Xabber

Open Source

Xabber (XMPP and Jabber) is a XMPP client for the Android Operating System.

Rambox

Open Source

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

YakYak

Open Source

YakYak is a desktop chat client for Google Hangouts.

Pidgin

Open Source

Pidgin is a free and open-source chat client which supports AIM, Google Talk, ICQ, XMPP protocols.

Trillian

Freemium

Trillian is a proprietary multiprotocol instant messaging application.

Miranda IM

Open Source

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

IM+

Freemium

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

Kopete

Open Source

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…