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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.
In the end there are lots of libraries for components out there to use. I regularly turn to this list https://github.com/mhrimaz/AwesomeJavaFX to check what is "out there".
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.