* [React hCaptcha Component Library v2.2.0](https://github.com/hCaptcha/react-hcaptcha) – hCaptcha component library for ReactJS and Preact that protects user privacy.

* [ALTCHA v3.2.2](https://github.com/altcha-org/altcha) – Self-hosted privacy-first security solution protecting websites and APIs from spam using a proof-of-work mechanism.