IOTA
https://en.wikipedia.org/wiki/IOTA_(technology)

https://iota.org/

The IOTA Whitepaper
https://iota.org/IOTA_Whitepaper.pdf

People have not started to grasp and appreciate the fact that IOTA has got rid of miners. In IOTA, the transaction issuers are also transaction approvers and these two parties are no longer decoupled as in Bitcoin and Ethereum which use miners as the transactions approvers. This will bring a huge advantage for IOTA.
https://satoshiwatch.com/coins/iota/in-depth/iota-dag-tangle/

IOTA compared to Blockchain
https://ukcryptocurrency.com/iota/tangle-vs-blockchain/

IOTA is based on a directed acyclic graph (DAG) aka the Tangle, not a Blockchain
IOTA has no mining, no blocks, no difficulty
IOTA has no transaction fees
IOTA scales almost infinitely, unlike Blockchains
IOTA is not solely made as a currency but as an interoperability protocol that solves the problems of the IoT
IOTA wants to enable the machine economy
IOTA is lead by the IOTA Foundation, an NGO registered in Germany (approx. Oct. 2017)

IOTA and the Internet of things
https://coincentral.com/meet-tangle-cryptos-blockchain-alternative/