Numbas is an open-source system for creating SCORM-compliant exams which run entirely in the browser, developed by Newcastle University's School of Maths and Stats.
This repository is an editor for creating Numbas exams.
Instructions for installation on a Linux server (so that the editor can be used by multiple people) can be found at http://numbas.github.com/editor/. Note that a full installation like this is not necessary if you just want to try out the editor on your personal desktop or laptop computer.
Note that it is in no way ready for production use yet!
Some icons from Iconic Icon Set © P.J. Onori, Licensed under Creative Commons Attribution-ShareAlike 3.0 Unported.