I've written quite a bit of security/cryptography-related code over the past 1.5 years. Sharing two packages that I think will be relevant to this community (+ would love any feedback!):

https://github.com/privy-io/shamir-secret-sharing (3rd party audited)

https://github.com/benjreinhart/secure-password-utilities

Are there any standards around SSS similar to psafe3 for password managers? I'm doing some research into implementing SSS in a customer friendly way.

Not that I am aware of. There is a lot of literature on SSS, but I don't actually know how often it's used in real-world apps (particularly in non-crypto).

Maybe I misunderstood you. The library I posted above is production-ready as it has undergone a independent third party audit (which you can find here: https://cure53.de/audit-report_privy-sss-library.pdf).

privy.io uses this in production for its embedded wallets feature.

I think Argent uses a form of it. I want to productize it.