* [FCaptcha v1.6.0](https://github.com/WebDecoy/FCaptcha) – Detect bots, vision-based AI agents, headless browsers and automation using 40+ behavioral signals plus server-verified SHA-256 proof-of-work.

* [GoCaptcha v2.0.5](https://github.com/wenlng/go-captcha) – High-performance, modular behavioral CAPTCHA library for Go supporting click, slide, drag-drop, and rotate modes.

* [better-captcha @better-captcha/soli...](https://github.com/LuggaPugga/better-captcha) – Framework-agnostic wrappers for CAPTCHA providers sharing lifecycle, render flow, and control handle to swap vendors without changing UI.

* [Cap standalone@2.1.5](https://github.com/tiagozip/cap) – Lightweight, modern CAPTCHA alternative using SHA-256 proof-of-work focused on privacy and ease of integration.

* [WAF 7.3](https://github.com/aaPanel/aaWAF) – Web application firewall protecting against SQL injection, XSS, SSRF, and other web attacks.

* [Scrapfly Anti-bot Detector v2.6](https://github.com/scrapfly/Antibot-Detector) – Manifest V3 Chrome extension detecting CAPTCHAs, anti-bot systems, and browser fingerprinting in real time with confidence scores and capture tools.

* [ALTCHA JS Library v2.0.0-beta.1](https://github.com/altcha-org/altcha-lib) – Lightweight, zero-dependency JavaScript library for creating and verifying ALTCHA challenges.