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Tremendous - Tremendous is a customer and employee loyalty platform that allows companies to reward their customers for surveys promotions and referrals.

Gyft - Buy Digital and eGift Cards | Free Mobile Gift Card App

Rybbon - Send digital e-gift cards as marketing incentives or rewards with Rybbon, which integrates with Marketo, HubSpot, SurveyMonkey, and Qualtrics.

PointsPrizes - Earn free gift card codes from top brands, by doing offers and watching advertisements.