Our great sponsors
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Signal-Server
Server supporting the Signal Private Messenger applications on Android, Desktop, and iOS
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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.
Additionally, Signal, an alternative to Threema, does have all of their code open source including the backend. https://github.com/signalapp/Signal-Server
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.