Google Apps for Education app: https://www.google.com/enterprise/marketplace/viewListing?productListingId=7566+1875579201173098458
Website: http://www.haikulearning.com/
Free iPad app: https://itunes.apple.com/us/app/powerschool-learning/id1158313040?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/powerschool-learning/id1158313040?mt=8&at=10l6SU
Google Chrome app: https://chrome.google.com/webstore/detail/powerschool-learning/fgpoakifbipnkhifgabffhdkdnloobhm