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Generate verification images dynamically
CrowdSec is an open-source cyber security tool. This plugin blocks detected attackers or display them a captcha to check they are not bots.
It is a simple PHP script to generate captcha for form validation. It can be integrated in any website for captcha generation.
The official PHP bouncers library for the CrowdSec LAPI
Java Captcha Generator
Nice Captcha with good quality and security for keeping safe from bots using PHP.
easy to use captcha tool