Liquid is a blockchain platform that was created by the fintech company Quoine, that has a suite of blockchain powered financial services. Liquid is focused on providing liquidity to crypto industry. The platform offers a "worldbook" which is a multi-market order book that aggregates liquidity sources to one order book and supports trading in multiple currencies. Liquid has several features that are aimed at increasing the liquidity of crypto assets. The platform includes smart order routing, a currency conversion engine, fiat management, and other trading tools. Liquid is powered by the QASH token, which was released in an ICO that raised $105 million.

QUOINE is a Japanese fintech company that is developing several liquidity focused trading platforms. QUOINE was the first cryptocurrency company to be officially licensed by the Japanese Financial Services Agency.
QUOINE runs 2 exchanges and a platform called LIQUID, that is designed to solve the problems related to liquidity in crypto markets. Quoinex is a fully regulated Crypto-Fiat exchange and was the first exchange to ever be audited by Deloitte. Qryptos is a crypto-only exchange.
The company's exchanges have an attractive fee structure

Trading Fee: 0 for base currency pairs, 0.25% for BTC and BHC pairs, 0.1% for ETH pairs
Withdrawal Fee: $5/5 Euros on fiat currency, Free on Crypto withdrawals
Number of Tokens/Coins: 50

QUOINE's platforms are powered by the QASH utility token.

BitFinex is a bitcoin to fiat exchange, a margin trading exchange, and a liquidity provider. The platform offers a number of features that expand the financial positions you can take - for example the ability to short Bitcoin via margin trading.
The exchange also offers a set of other cryptos apart from bitcoin such as Litecoin and Ethereum.
Deposits and withdrawals take place via the standard bank transfer means with fees of 0.1% and a minimum of $20. Bitcoin and Litecoin are free.
BitFinex takes security seriously and have moved from a hot wallet cold wallet set up to segregating customer funds where each user has access to their own wallet which they can review on the blockchain.
Bitfinex was hacked on 03 August 2016 and around 120,000 BTC were stolen.
Fee of 0.1% for most trades