CryptoKitties - Breed and collect adorable creatures using Ethereum
CryptoAlpaca - Adopt unique alpaca on blockchain and shear wools everyday
OpenSea - Ebay for cryptogoods. Buy and sell items on the blockchain.
Mars Genesis - 10,000 unique parcels of Mars stored on the blockchain
Rarible - Create, sell, collect digital items secured with blockchain
MetaMask.io - A crypto wallet & gateway to blockchain apps