The Internet boosted collaboration and innovation, making possible Open Source, Free Software, and the digital ecosystem we enjoy today, from connected cars to mobile apps. Open edX may be the latest and most exciting Free/Libre Open Source Software project in education today. Open edX is currently used from MOOCs to massive national e-learning deployments, focusing on courseware delivery. edX is an LTI consumer and producer so integration with existing LMS's is easier. True to the founding culture established by MIT and Harvard, the now independent non-profit edX team has adopted an open and collaborative approach, releasing the code under a GNU Affero General Public License (AGPL) for the core platform, and an Apache license for some libraries such as XBlock (for extensions). The community is invited to use, improve, and share code and practices, to accelerate innovation. The goal is to educate 1 billion students! This talk will cover the problem solved (a little history of edX and e-learning), an overview of the architecture of Open edX, and finally pointers for those who want to explore further.