Instant messaging (IM)
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- Internet Relay Chat (IRC)
- Jitsi (2003)
- Mattermost (2015)
- Matrix (client: Riot)
- Rocket.Chat (at least 2016)
- Zulip
- Keybase (open-source client with proprietary server)
- Wire (Open Source - End to End Encrypted)
- Gitter (2014)
- Discord (2015)
See also
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