Sure, Slack Slack is awesome.

But have you considered these open source alternatives?

They are free, self-hostable and community-driven.

Check by yourself: Discourse  Discourse .

  1. So is Discourse Discourse

    A platform for community discussion

    ★ 42.5k forum License: Apache-2.0

    Discourse is the online home for your community. We offer a 100% open source community platform to those who want complete control over how and where their site is run.

    HomeExchange