How open source Mattermost is sneaking up on Slack’s messaging empire

TechRepublic - February 6, 2019

Slack competitor Mattermost raises $20 million for its workplace chat app

VentureBeat - February 5, 2019

The Slack-alternative for engineers delivers security and privacy

The Register - February 5, 2019

Mattermost help teams of software developers collaborate on DevOps

SiliconANGLE - February 5, 2019

GitLab Mattermost, on open source, on-premises Slack alternative

GitLab.com - August 18, 2015

“We found Mattermost to be the leading open source Slack-alternative…”