Mootools-mootorial is a project mainly written in JAVASCRIPT and PHP, it's free.
The 'Mootorial'
A currently unofficial, pre-alpha reboot of Aaron Newton's excellent original Mootorial.
The focus of this project is the content itself. If you want to contribute, please focus your efforts on updating and improving the content.
There is a spreadsheet here for people to see what others are working on, and what is still outstanding.
The runner is being worked on by @fakedarren. If you're interested in contributing to the PHP code, please talk to @fakedarren before making any changes.