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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.
And then also look at Swarmpit https://github.com/swarmpit/swarmpit. It was last updated Aug 28, 2020 as well, so I don't know how active it is, but I also used it for a while before sticking with Portainer ultimately.
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.