
Description: reCAPTCHA is a free service by Google that protects websites from spam and abuse. It uses advanced risk analysis techniques to tell humans and bots apart. The service provides different versions of CAPTCHAs and captcha alternatives to fit site needs.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Securimage is an open source CAPTCHA script written in PHP that generates complex image and audio CAPTCHAs. It can help protect websites from spam and abuse.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API