KIPP Chicago is currently using these tools for K-8 blended learning.
Website: http://wowzers.com/
Google Chrome app: https://chrome.google.com/webstore/detail/ahgfknfdplnpiiiiejiimkojdkjlfmdo
Website: https://www.stmath.com/
Free iPad app: https://itunes.apple.com/us/app/st-math-school-version/id550846820?mt=8&at=10l6SU
Free Android Tablet app: https://play.google.com/store/apps/details?id=air.net.mindresearch.stmath