CryptoKitties - Breed and collect adorable creatures using Ethereum
CryptoAlpaca - Adopt unique alpaca on blockchain and shear wools everyday
Cryptopurr - Facebook for cryptokitties built on Ethereum
Mars Genesis - 10,000 unique parcels of Mars stored on the blockchain
CryptoKittydex - A tool to help CryptoKitty geneticists decode the genome
MetaMask.io - A crypto wallet & gateway to blockchain apps