Introducing Proton CAPTCHA | Proton
We developed our own CAPTCHA service to ensure it is secure, respects privacy, and optimized to be usable by everyone. Find out how it works.
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The EU has released an open source CAPTCHA solution
https://joinup.ec.europa.eu/collection/eupl/news/eu-captcha-under-eupl-12
So there is one, very nice!
Heard about mCaptcha too
Not sure why they used sha256 though, it mostly defeats the goal of protecting from bots (those can get access to ASICs, as oposed to regular users).
Does it work well?
It does, yes.
