Textnow.com - It lets you text your friends, aka my only source of happiness

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.

Dingtone - Dingtone is a free call and texting application for making unlimited calls and text messages to any number at the moment registered in any part of the world by any cellular company.

Clever - syncing between education applications for K-12 schools

TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.

Claroline - Claroline is a collaborative eLearning and eWorking platform.