Securimage CAPTCHA Generator

Securimage CAPTCHA Generator: "Description: A highly customizable PHP class for generating CAPTCHA images to prevent programs from filling out your forms. This does everything from create and output the image, to validate the code entered by the user in the form. It can show an image and validate the user entered code in just 3 lines of PHP. This class provides a simple interface to using CAPTCHA images so you can easily make your own custom forms that implement this class. It supports variable length codes, custom TTF fonts, custom colors, optional lines over the text to help confuse programs, angled text, transparent text and more. Includes several code examples and various sample images in the zip file."