Pidgin
Open Source
Pidgin is a free and open-source chat client which supports AIM, Google Talk, ICQ, XMPP protocols.
Tox
Open Source
Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption.
Jitsi
Open Source
Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application.
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…
Quassel IRC
Open Source
Quassel IRC, or Quassel, is a graphical, distributed, cross-platform IRC client.
iMessage
Free
iMessage is an instant messaging service.
KakaoTalk
Freemium
KakaoTalk (Korean: 카카오톡), or sometimes KaTalk, is a free mobile instant messaging application for smartphones with free text and free call features.
Rambox
Open Source
Rambox is a free and Open Source messaging and emailing app that combines common web applications into one.
Coccinella
Open Source
Coccinella is a free and open-source cross-platform client for the XMPP/Jabber-instant messaging-protocol.
YakYak
Open Source
YakYak is a desktop chat client for Google Hangouts.
Adium
Open Source
Adium is an Open source multi-protocol instant messaging client for Mac OS X, supports MSN, Jabber, Yahoo! and other networks.
Signal
Open Source
Signal is the most scalable encryption tool.
Glip
Freemium
Glip is fully searchable, real-time group chat; video chat, task management, file sharing app.
ICQ
Free
ICQ is an open source instant messaging software.
Instantbird
Open Source
Instantbird is a cross-platform instant messaging client based on Mozillas XULRunner and the open source library libpurple used in Pidgin.
Spark
Open Source
Apache Spark is an open-source cluster-computing framework.
Psi+
Open Source
Psi is a cross-platform powerful XMPP/Jabber client (Qt, C++) designed for the Jabber power users. Psi+ is a development branch of Psi IM XMPP/Jabber client.
Tencent QQ
Free
Tencent QQ (QQ) is an instant messaging software service.
Zulip
Open Source
Zulip is a chat and collaborative software.
Compare Trillian with alternatives
Compare Quassel IRC and Trillian and decide which is most suitable for you.
Compare Instantbird and Trillian and decide which is most suitable for you.
Compare Tencent QQ and Trillian and decide which is most suitable for you.
Compare Coccinella and Trillian and decide which is most suitable for you.