Edmodo - Where Learning Happens
Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!
NEO LMS - LMS for schools, universities, and school districts
Chamilo - Chamilo is a software that allows you to create a virtual campus for the provision of online or semi-online training.
planetHS - PlanetHS connects school communities online.
Open edX - Open edX is implemented mostly in Python (with some Ruby and NodeJS as well) and the code is being...