Our great sponsors
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You can take a look to https://github.com/ory/fosite
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warrant
Warrant is a highly scalable, centralized authorization service based on Google Zanzibar, used for defining, querying, and auditing application authorization models and access control rules.
For authn, I'd recommend any of the ones folks have mentioned here. For authz, it depends a lot on your use case(s). If you're going to be doing anything fine-grained or granular (e.g. object or resource based permissions), you might want to explore pairing your authn solution with a fine grained authz system like Warrant (https://github.com/warrant-dev/warrant)
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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.