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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.
If the specification is written in a machine-readable language and complete and executable then it would be an implementation.
seL4[1] is a great example of how a specification, an implementation and a formal proof system inter-work to prove an OS kernel conforms to the specs. When you read through the papers, you will see times when they found bugs in the specification.
[1]:http://sel4.systems/
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.