Aserto - Fine-grained, scalable authorization in minutes
TypingDNA Authenticator - 2FA codes in your browser, secured by the way you type
Cerbos - Cerbos helps teams separate their authorization process from their core application code, making their authorization system more scalable, more secure and easier to change as the application evolves.
PropelAuth - PropelAuth hosts and manages your authentication.
authzed - The platform to store, compute, and validate app permissions
Authorizer - Authorizer is an open-source authentication and authorization solution for your applications.