mattermost (Open source Slack-alternative in Golang and React) ¶ See also https://en.wikipedia.org/wiki/Mattermost https://github.com/mattermost/mattermost-server https://docs.mattermost.com/ https://github.com/mattermost/docs mattermost versions mattermost 5.10.0 (2019-04-16) mattermost sphinx conf.py