NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
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.
Email Verifier - Email verifier app lets you verify email.
Clever - syncing between education applications for K-12 schools
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Claroline - Claroline is a collaborative eLearning and eWorking platform.