5 listed
Open-source alternatives to Slack
5 companies listed as an alternative to Slack, all open source. Compare licenses, categories and repositories.
- E
Element
No. 0119Secure, decentralised communication built on Matrix
CommunicationAGPL-3.0est. 2017
Open source - H
Huly
No. 0162All-in-one project management platform
ProductivityEPL-2.0est. 2021
Open source - K
Kandra Labs
No. 0183Company behind Zulip, organized threaded team chat
CommunicationApache-2.0est. 2012
Open source - M
Mattermost
No. 0221Secure collaboration platform for technical and mission-critical teams
CommunicationAGPL-3.0est. 2016
Open source - R
Rocket.Chat
No. 0586Secure communications platform for team chat and omnichannel
CommunicationMITest. 2015
Open source
Related alternatives
Other products these companies are listed against.