SuperRare - Create, collect and trade rare crypto art and collectibles
NIFTYgallery - Design and share collections for your cryptocollectibles
OpenSea - Ebay for cryptogoods. Buy and sell items on the blockchain.
Rarible - Create, sell, collect digital items secured with blockchain
CryptoKitties - Breed and collect adorable creatures using Ethereum
Nifty Ink - Draw something and make it a NFT for less than 1 cent