How Qtum Makes Ethereum Contracts Run on the UTXO Model
Qtum integrated the EVM onto a UTXO based blockchain, and writing contracts for this should be just as easy as Ethereum, but you get the benefits of the UTXO model. These benefits include mobile/light wallet support by SPV, a more stable model (whereas Ethereum has forked many times to fix problems with this), and compatibility with existing Bitcoin tools and protocols.
http://news.8btc.com/how-qtum-makes-ethereum-contracts-run-on-the-utxo-model