Is the one that I have used in the past before learning how to create them myself. Use the menu on the far left to navigate around. The scripts section being one of my favourites:
Although I haven't used this site in years. The scripts part and the other link I gave still seems free as I can access the code for them without registering, although the main website: www.bravenet.com, that offers loads of other stuff, although free, they require you to become a member.
Sign up at your own risk, I have no idea what it's like.