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The War on Passwords Is One Step Closer to Being Over
(www.wired.com)
This is a most excellent place for technology news and articles.
What do you means by this? What part do you want to be open source? Passkey are just cryptographic keys, no part of that requires anything unfree. There's aready an open source authentication stack you can use to implement them. You can store them completely locally with KeyPassXC for selfhost Vaultwarden to store them remotely. Both are open source?