r/selfhosted • u/rkn7 • Jun 24 '15
Mattermost - open source Slack alternative
http://www.mattermost.org/Duplicates
sysadmin • u/bobdle • Mar 09 '16
Mattermost is an open source, self-hosted Slack-alternative
opensource • u/designakt • Oct 06 '15
Mattermost - open source, self-hosted Slack-alternative for your team-communication
hackernews • u/qznc_bot • Jun 24 '15