Chris Graham and Christian Lawson-Perfect
Newcastle University.
Numbas is an open-source system developed by the e-Learning Unit of Newcastle University's School of Maths and Stats, based on many years of use, experience and research into e-assessment.
It's aimed at numerate disciplines.
It creates SCORM-compliant exams which run entirely in the browser, compatible with VLEs such as Blackboard and Moodle.