These are class files that I've gathered from around the internet.

I've renamed the files to follow a standard scheme.

This is where each file came from:

My Name                : Original Name    : From
PasswordHash.class.php : PasswordHash.php : http://www.openwall.com/phpass/
recaptchalib.php       : recaptchalib.php : https://code.google.com/p/recaptcha/

~ Luke Shumaker <http://lukeshu.ath.cx>
Happy Hacking!