Fruum is an open-source embeddable communication solution for discussions, documentation and more.
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Pro Free and open source
Source code is available on GitHub under Apache License.
All updates in the forum happen real-time. No reloads required.
Pro Slack integration
Plays well with Slack out of the box. Get notifications when users post new stuff or use the /fruum command to query the forum.
Pro Single Sign On (SSO)
Fruum can tie its user authentication with the authentication system of the hosting website, thus utilize the existing user base without requiring multiple sign-ups.