CADSoft Eagle ready-made Layouts

Is there a site when one can get already designed Eagle schematics and layouts.

Like if you don't want to design yet another 555 timer, but use a ready one or just slightly change the existion one.

Sparkfun and Adafruit publish all of their designs online. You can copy and modify them as much as you want. Adafruit changed their website recently so it's harder to find them. Go to GitHub and search for Adafruit there.

I've made several custom shields by starting from an Eagle file from one of those two and adding components where I needed them.

Thanks guys, looks just right.

Just for reference, there is this site with lots OrCAD designs:

I don't know if it can be of any use to Eagle users.