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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.
While I don't have much experience with it directly, I do know that Google's protobuf was designed with minimal footprint capabilities in mind. While it might not work out-the-box for embedded systems, it looks like there is a well maintained open source library NanoPB that "is a small code-size Protocol Buffers implementation in ansi C. It is especially suitable for use in microcontrollers, but fits any memory restricted system." And for added reassurance, it looks like Chromium has a dependency on NanoPB.
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.