Tremendous - Tremendous is a customer and employee loyalty platform that allows companies to reward their customers for surveys promotions and referrals.
QuickMark - QuickMark makes everything possible.
Giftbit - Buy, send and track digital gift cards for your reward and incentive programs.
Barcode & QR Code Scanner - A free app which allow to read and generate barcodes for Android.
Rybbon - Send digital e-gift cards as marketing incentives or rewards with Rybbon, which integrates with Marketo, HubSpot, SurveyMonkey, and Qualtrics.
ZXing - Barcode Scanner for Android