TAO® is an open source platform. It enables the administration and delivery of rich multilingual electronic tests.

It gives you the opportunity to create your own tests, manage them and deliver them into highly flexible environments
It is a web-based platform that enables human-computer interaction in testing and the integration of multimedia
It supports a wide range of assessments: standard (such as QTI), simple, playful, psychometric...

Currently, TAO is used across the world and is always looking for contributions