CryptoKitties - Breed and collect adorable creatures using Ethereum
Set in Block - Blockchain-based permanent message creator and reader
MetaMask.io - A crypto wallet & gateway to blockchain apps
CryptoFighters - Collect, train and battle with unique fighters with Ethereum
Ethereum Gas Monitor - Ethereum Gas Monitor is a mac menu bar app that displays gas prices for fast, average and safe slow ethereum transactions.
Mars Genesis - 10,000 unique parcels of Mars stored on the blockchain