From what we've seen at Mattermost (open source Slack-alternative, https://mattermost.com/ https://mattermost.com/) supporting on-premises deployments with an o

From what we've seen at Mattermost (open source Slack-alternative, https://mattermost.com/ https://mattermost.com/) supporting on-premises deployments with an open source community is actually pretty awesome. We have over a thousand people on our forums helping each other out, people are building installers for Mattermost in Puppet, Chef, Ansible, Docker, etc. (just web search to find them). We're also getting help writing and updating our deployment docs (https://docs.mattermost.com/ https://docs.mattermost.com/).