Instant messaging (IM)

wikipedia:Instant messaging (Trends)

• Element (2016). Open Source
• Discord (2015). Sign up: email or SMS. CLI not available.
• Mattermost (2015)

• Gitter (2014)
• Slack (2013)
• Internet Relay Chat (IRC)
• Jitsi (2003)

• Matrix (client: Riot)
• Rocket.Chat (at least 2016)
• Zulip (2012)
• Keybase (open-source client with proprietary server)
• Wire (Open Source - End to End Encrypted)

• Google Chat: Spaces

Free plans

• Microsoft Teams (March 2017)
• Chanty (2017)
• Fleep (2012)

Related terms

• Intercom (2011)
• Comparison of cross-platform instant messaging clients

See also

• IM, Messenger, Slack, Mattermost, RocketChat, Gitter, Discord, Microsoft Teams, Skype, Amazon Chime, Zoom, Google Chat, AWS Chatbot, LiveChat, APNs, Arattai, Zulip, Chanty, Fleep, Spaces, Zoho Connect, QQ, WhatsApp, Cliq, iMessage