PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.
Open edX - Open edX is implemented mostly in Python (with some Ruby and NodeJS as well) and the code is being...
Clever - syncing between education applications for K-12 schools
LMS Collaborator - LMS Collaborator is a state-of-the-art learning management system designed to meet the need for corporate training, upskilling, and evaluation with flexible integration abilities.
Claroline - Claroline is a collaborative eLearning and eWorking platform.
ILIAS - For several of my clients in the health care domain, ILIAS turned out to be an excellent choice.