Qtum (pronounced as Quantum) is a project coming out of China that aims to make decentralised blockchain technology easy to deploy for enterprises. It provides a Turing-complete blockchain stack and is able to execute smart contracts and decentralised applications like the Ethereum blockchain.
Qtum builds on Bitcoin's UTXO transaction model and uses the Proof-of-Stake algorithm. It is backed by some highly prominent members of the blockchain community such as Anthony Di Iorio, Xu Star, Bo Shen, David Lee, Jehan Chu and Roger Ver.
Qtum conducted its crowdsale in March 2017 where 51 million Qtum tokens were sold in 117 hours raising 11,156 BTC and 77,081 ETH (~US$15.6 million)