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 ...
Mattermost : Mattermost is a self-hosted solution for bringing all your team communication to one place, and making it searchable and accessible anywhere
cal.com : Open source meeting scheduling tool. Send a link, let others book a slot. Calendly alternative.
Cachet : Beautiful & simple service statuses. The open source status page system, for everyone.
Beehive : Beehive is an event and agent system, which allows you to create your own agents that perform automated tasks triggered by events and filters. It is m...