Bluzelle (BLZ) - I haven't bought it yet, but I am thinking of buying some and I'm asking your opinion.
Bluzelle is a decentralized, on-demand, immutable and scalable database service for dApps. It's very interesting because Bluzelle will have an MVP (Minimum Viable Product) in April this year. They have partnerships with 0x, Zilliqa.
Bluzelle makes data fields small and organized in structure and there is an option to manipulate that data: create, read, update, and delete. That's why it's not in competition with the file storage coin like Storj, Filecoin, Sia.