Loopring is the project for decentralized ERC20 token exchange. The first public blockchain Loopring supports will be Ethereum, but other blockchains with smart contract capability can also be supported in a similar way, such as NEO, Qtum, and EOS. To have an overview of Loopring, please visit our website - https://loopring.org.
Loopring is not a decentralized exchange per se, as all building blocks of a traditional exchange are dissembled and put together again as different roles in a decentralized environment. These roles include, but may not be limited to, wallets, relays, orderbook browsers, ring-miners, and asset tokenization services.