Edutools compares open source and proprietary learning content management systems in terms of their features.

UNESCO: Free and Open Source Software for E-learning

Second, to this very point of creating real value, the quality of much of the online learning products and services (from content to learning management systems and on and on) is frankly all over the place.

FORBES: Is There a K-12 Online Learning 'Bubble'?

My second mentor helped me see the importance of learning the different CMSs (Content Management Systems) used in my industry.

WHITEHOUSE: The Power to Program