Website: http://www.literacycenter.net/
Paid iPad app: https://itunes.apple.com/us/app/write-to-read/id590707197?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/write-to-read-for-iphone/id691127860?mt=8&uo=4&at=10l6SU
Website: http://www.starfall.com/
Free iPad app: https://itunes.apple.com/us/app/sight-words-learn-to-read/id447065810?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/sight-words!/id447064038?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/sight-words-learn-to-read/id447065810?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/sight-words!/id447064038?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.playsightwords
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.playsightwordsplus