Matrix : Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distribu...
Vertabase Timer : Fun & Easy way to track time on projects and track time on clients.
Sleek desktop time tracking clock for Windows and MAC.
Zulip : Zulip is a powerful, open source group chat application that combines the immediacy of real-time chat with the productivity benefits of threaded conve...
Mattermost : Mattermost is a self-hosted solution for bringing all your team communication to one place, and making it searchable and accessible anywhere
Imagine all your team communication in one place, instantly searchable, available wherever you go. That's Slack.