Riot : Riot allows teams to communicate across a wide range of collaboration apps. If some team members use Riot while others use IRC, Slack or Gitter, Riot ...
Zulip : Powerful slack-like open source group chat
Lemmy : Lemmy is a selfhosted social link aggregation and discussion platform. It is completely free and open, and not controlled by any company. This means t...
Matrix : Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distribu...
Prometheus : Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. Prometheus's main features are:
a multi-dimensio...
Mattermost is a self-hosted solution for bringing all your team communication to one place, and making it searchable and accessible anywhere