Our great sponsors
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jitsi
Jitsi is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, IRC and many other useful features.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
As for other licenses, you must check them individually. "Open source" has lots of meanings and sub-branches, so you must pay attention to the fine details. Jitsi, for instance, allows you to do anything with their code – including commercial use: https://github.com/jitsi/jitsi/blob/master/LICENSE
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.