What other, free chat platforms are compatible with Slack Apps, besides Mattermost?

That’s the question. Thanks!

Hi there.

A quick research done on my end shows that Slack can be integrated with multiple chat platforms. For example, please check out the following integrations available on Slack’s App Directory (besides Mattermost itself):

  • Slack & Stride via Joint Rooms
  • Slack & Skype, HipChat, and many other chat platforms via Sameroom

Hope that helps.