CentOS 7 - CERN for x86_64: Letter M: mattermost-desktop
mattermost-desktop - Mattermost is an open source, self-hosted Slack-alternativ
Mattermost - Private Cloud Slack-alternative
Messaging that Works
Share messages and files across phones and PCs, with archiving and instant search. Integrate with your existing systems. All while keeping vital communications behind your firewall.
Data Center Ready
100% self-hosted solution with integrated authentication, compliance, auditing, high availability and a host of security and management features for enterprise organizations.
Slack-compatible, not Slack-limited
Mattermost supports a superset of Slack’s popular features, including webhook APIs, along with import of Slack channels, users, and even theme colors.