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A recent common usage is by the https://haveibeenpwned.com leaked password check database, worked on in part by the Cloudflare team:

https://www.troyhunt.com/ive-just-launched-pwned-passwords-v...

https://blog.cloudflare.com/validating-leaked-passwords-with...

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Okta's PassProtect Chrome extension also uses k-anonymity.

https://www.okta.com/blog/2018/05/add-passprotect-to-your-we...

Looks like that's just a wrapper around the Have I Been Pwned API, of which there are many examples. 1Password built it into their password manager which is probably one of the best integrations for it.

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