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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.
The official spring documentation is pretty good and also has previous migration guides too: https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.0-Migration-Guide It doesn't have everything, so if you find extra stuff you can do a PR to add it ;) As usual, it's best you upgrade step by step (2.4->2.5->2.6 etc) not all at once
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Hence, a higher number means a more popular project.