Font Awesome - Font Awesome makes it easy to add vector icons and social logos to your website. And version 5 is redesigned and built from the ground up!
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.
The Noun Project - Creating, Sharing and Celebrating the World's Visual Language
Clever - syncing between education applications for K-12 schools
Nucleo - Commercial vector icons and accompanying apps to manage and customize them.
Claroline - Claroline is a collaborative eLearning and eWorking platform.