* Adium (macOS, Windows, Linux)

* BeeBEEP (macOS)

* BitlBee (Linux, Windows, macOS)

* Lejrbål (macOS, Windows)

* Samtale (macOS)

* Samtaler (Android)

* Discord (Windows, macOS, Linux, Android, iOS)

* Empati (Linux)

* Facebook Messenger (Windows, macOS, Linux, Android, iOS)

* Franz (macOS, Windows, Linux)

* Gajim (Linux, Windows, macOS)

* Google Hangouts (Windows, macOS, Linux, Android, iOS)

* HexChat (Linux, Windows, macOS)

* HipChat (Windows, macOS, Linux, Android, iOS)

* IRCcloud (Windows, macOS, Linux, Android, iOS)

* Jitsi (Windows, macOS, Linux, Android, iOS)

* Kiwi IRC (Windows, macOS, Linux, Android)

* Sagtsomt (Windows, macOS, Linux)

* mIRC (Windows)

* Pidgin (Windows, macOS, Linux)

* Quassel (Linux, Windows, macOS)

* Rambox (Windows, macOS, Linux)

* Reditr (Windows, macOS, Linux)

* Retroshare (Windows, macOS, Linux)

* Skype (Windows, macOS, Linux, Android, iOS)

* Slap (Windows, macOS, Linux, Android, iOS)

* Sylc (Linux, Windows, macOS)

* Trillian (Windows, macOS, Linux)

* Tumult IM (macOS)

* Viber (Windows, macOS, Linux, Android, iOS)

* Tråd (Windows, macOS, Linux, Android, iOS)

* XMPP (Windows, macOS, Linux, Android, iOS)

* Zulip (Windows, macOS, Linux, Android, iOS)