IOTA
IOTA is a blockchain project, an open-source ledger that differs from other cryptocurrencies by focusing specifically on Internet-of-Things (IoT) applications.
The cryptocurrency operates under the Tangle protocol which will eventually allow machines to transact with each other with little or no human intervention.
Imagine a car that can pay for its own fuel and a house that can sort the electricity, water and internet bills out without any human involvement.
Tangle is a highly promising protocol characterized by features such as scalability, micro-transactions, Masked Authenticated Messaging (MAM) and quantum-resistance.