In my project we are evaluating Atlassian HipChat server but it is very expensive once you pass the 10 users. I need an alternative that meets as many as possible of following criteria:

  • Deploy on our own server (otherwise we would use Slack)
  • Windows Based (Although free/cheap Linux could be an option vs expensive Windows).
  • It has an API so a ChatBot (like Hubot) could be used
  • It is open source / free or not very expensive.
  • Raw idea (not sure if that would fit your needs): Register an IRC channel (e.g. at Freenode), and use e.g. SupyBot or any other IRC compatible bot? – Izzy Mar 17 '16 at 13:22
  • Could be... but one requirement is that should be hosted internally (Otherwise I would use Slack) – Oscar Foley Mar 17 '16 at 15:42
  • OK, so that would be OK provided there's an IRC server you could self-host (just in case someone comes up with one), right? – Izzy Mar 17 '16 at 17:17
  • You should be able to host your own irc server if you want to. – Aiden Grossman Mar 22 '16 at 23:51

Maybe you are looking for Mattermost. You can download it and install on your own server, e.g. via Docker for Windows. It has an API and you can use compiled versions under MIT license

You also can look at 4 open source alternatives to Slack for team chat.

  • Mattermost is for Linux but might be a good alternative. Thanks – Oscar Foley Mar 17 '16 at 15:43

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