accessiBe - Making websites accessible to people with disabilities
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.
Sim Daltonism - From the perspective of a color blind person, some colors are impossible to distinguish.
Clever - syncing between education applications for K-12 schools
Coblis - If you are not suffering from a color vision deficiency it is very hard to imagine how it looks...
Claroline - Claroline is a collaborative eLearning and eWorking platform.