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Hubi is a centralized Chinese exchange describing itself as a Global Digital Asset Exchange. It was established in 2018 to provide currency, OTC and stable coin trading. Major assets provided by Hubi are BTC, ETH and USDT. 
DDEX uses a hybrid model decentralized exchange, where no user account is created. It also describes itself as a most advanced margin trading platform on Ethereum. 
Coinswitch is an aggregator of exchanges for trading digital assets that appeared on the financial market in 2017. During this period of time, the company has been actively developing and has become popular among users around the world. The exchange brings together several of the leading exchanges around the world to ensure fast order execution and no trading restrictions on some of the world's most popular coins and tokens. It is a global platform, therefore it is available for traders from any country in the world.