Microsoft Office Access - Access is now much more than a way to create desktop databases. It’s an easy-to-use tool for quickly creating browser-based database applications.

Teachable - Create and sell beautiful online courses with the platform used by the best online entrepreneurs to sell $100m+ to over 4 million students worldwide.

LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...

Clever - syncing between education applications for K-12 schools

Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.

Claroline - Claroline is a collaborative eLearning and eWorking platform.