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

• Instant messaging (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, Telegram