Here is my list of reward system using blockchain technology
Loyyal (formerly known as RibbitRewards)
loyyal is the universal loyalty and rewards platform, built with blockchain and smart contract technology. It introduces interoperability to the currently fragmented industry, multi-branded coalitions, superior program liability management and dynamic issuance/redemption options customized for each unique relationship.
Incent is both a cryptographic token and a loyalty eco-system, which allows merchant clients to incentivise custom by rewarding their customers, at the point of transaction, which has the unique property of being convertible on the Waves blockchain.
Plutons are digital tokens issued on the Ethereum blockchain and awarded to the user as a rebate for using the Plutus app. Earned Plutons can be converted to spent in any NFC-enabled store in the same way as bitcoins.
Chain of Points
Points Blockchain that transforms any rewards program into an effective Loyalty tool.