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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.
I'm not the creator of this, but https://github.com/calendso/calendso#contributing makes it seem like they are open for contributions to the project. 🤙🏻
I'm not really familiar with railway.app, but from reading their site it seems similar to Hashicorp's new project Waypoint, which is FOSS: https://github.com/hashicorp/waypoint
NOTE:
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Hence, a higher number means a more popular project.