edX

The platform provides the full stack for creating and delivering online courses, certificates, and degree programs. It implements the infrastructure used by a major public learning site, handling course authoring, enrollment, progress tracking, assessment, and credential issuance. The code is released under an AGPL‑3.0 license and can be deployed on‑premises, allowing institutions to run their own instances without subscription fees.

It is aimed at universities, corporations, and other educational providers that want to offer large‑scale, instructor‑led or self‑paced learning experiences. The system supports a wide range of subject areas and can be integrated into enterprise training programs, giving employees access to curated curricula.

Distinctive aspects include its open‑source nature, the ability to self‑host the entire platform, and its proven scalability as the foundation of a global MOOC service that hosts courses from leading institutions worldwide.