Moodle is a course management system (CMS) - a free, Open Source software package designed using sound pedagogical principles, to help educators create effective online learning communities. You can learn more about Moodle at http://www.moodle.org.
This site provides a few extras that you can use on your moodle site including a few glossaries and an open source question bank.
A glossary of important chemistry terms created by my students.
A glossary to help your students study terms that are reoccurring on the SAT.
A database of common monatomic and polyatomic ions for Moodle.
An open source question bank with various subjects that can be imported into your own moodle site by authorized teachers.