A curated collection of the best open source projects tagged "Hashcash". Each listing includes a website screenshot along with a detailed review of its features.
Privacy-first CAPTCHA alternative with proof-of-work
Stars
7,663
Last commit
4 days ago
License
Apache-2.0
Lightweight open-source CAPTCHA solution using SHA-256 proof-of-work. 250x smaller than hCaptcha, fully customizable, and privacy-focused with zero telemetry.
Sent – Messaging Infrastructure for Developers. One API for SMS, WhatsApp, and RCS across 190+ countries.
Sent
