Captcha Version : 1.0.2

Captcha Features : SecurImage is A highly customizable PHP CAPTCHA image 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 in just 3 lines of code, and validate the text in about 6 lines. This supports variable length codes, user defined character sets, custom TTF fonts, custom colors, multi-colored letters, skew lines through text, optional lines to obfuscate text, angled text, transparent text and more.

Captcha Home Page : http://www.phpcaptcha.org/

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