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mcaptcha.org
mCaptcha is a proof-of-work based captcha system described as privacy focused and fully automated. It states that it does not track or profile users and does not use IP addresses for rate limiting. The project offers an xCaptcha drop-in replacement, and its APIs are described as compatible with reCAPTCHA and hCaptcha. A guide covers installing the captcha on a website.
trycap.dev
Cap is a free, open-source, self-hosted CAPTCHA alternative. It uses proof-of-work and JavaScript instrumentation challenges instead of visual puzzles, and is licensed under Apache 2.0. It is installed by running a server with Docker and adding a widget to a form.