Open edX is an Open Source Web-based system for creating, delivering and an analysing online courses at massive scale.
Nate Aune (Appsembler)
Open edX is also:
Open edX numbers (as of 2017):
Minimum of two servers: one for apps, the other for databases (MySQL and MongoDB).
Cost estimate to run an Open edX site on 6 EC2 AWS instances: from USD 950 to USD 1400 per month (video snippet).