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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.
"Writing an entire custom program" is the best way. Ruby has a nice package called bindata (https://github.com/dmendel/bindata) that works well for this purpose.
NOTE:
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Hence, a higher number means a more popular project.