Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!
Talent LMS - A super-easy, cloud LMS to train your employees, partners, customers or students.
ATutor - Free, open source LMS with integrated social networking
Edmodo - Where Learning Happens
aNewSpring - The learning platform for training providers
Open edX - Open edX is implemented mostly in Python (with some Ruby and NodeJS as well) and the code is being...