Telegram
Free
Telegram is a free cloud-based instant messaging platform.
Trillian
Freemium
Trillian is a proprietary multiprotocol instant messaging application.
Signal
Open Source
Signal is the most scalable encryption tool.
Wire
Free
Wire is a cross-platform, encrypted instant messaging client created by Wire Swiss. It is available for iOS, Android, Linux, Windows, macOS and Web browser cl…
ICQ
Free
ICQ is an open source instant messaging software.
qutIM
Open Source
qutIM is free and open-source multiprotocol (ICQ, Jabber, Mail.Ru, IRC, VKontakte) instant messenger.
Coccinella
Open Source
Coccinella is a free and open-source cross-platform client for the XMPP/Jabber-instant messaging-protocol.
Toky
Freemium
Toky is an automation platform.
Tox
Open Source
Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption.
Viber
Freemium
Viber Free Messenger and Phone Calls.
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…
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…
Spark
Open Source
Apache Spark is an open-source cluster-computing framework.
Finch
Open Source
Finch is a console-based IM program that lets you sign on to AIM, Jabber, MSN, Yahoo!, and other IM networks. It runs on Unixes. It uses GLib and ncurses.
Zulip
Open Source
Zulip is a chat and collaborative software.
Compare KakaoTalk with alternatives
Compare Coccinella and KakaoTalk and decide which is most suitable for you.