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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.
Perhaps diagrams.net (click 'more shapes' to add the electrical symbols). There is also yEd. It has logic gates, but I don't know if it has electrical components. Of course KiCAD is specifically designed for circuits, but that might not fit your application.
The other one I just remembered is QElectroTech.
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.