Claroline: Open Source eLearning. ‘Claroline is a free application based on PHP/MySQL allowing teachers or education organizations to create and administrate courses through the web. Developed from teachers to teachers, Claroline is built over sound pedagogical principles allowing a large variety of pedagogical setup including widening of traditional classroom and online collaborative learning. Claroline is translated in 32 languages and used by hundreds of institutions around the world. The software is released under Open Source licence (GPL). Downloading and using Claroline is completely free of charge.’
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A similar but more evolved system is Dokeos: http://www.dokeos.com