Open Passkey is an MIT licensed passkey repo with a FREE "backendless" auth server that means you can deploy with zero config. Support for 6 languages and 26 frameworks, with batteries included. Open Passkey prioritizes post-quantum algos though they are not supported by browsers yet.
Locke ID is a free password manager and secure inbox, protected by Fuzzypass. Fuzzypass is an alternative to a master password that provides 100 bits of entropy, making it approximately 2^50 times stronger than a "strong" password.