Site: ftx.com
Mobile app: -
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Update: It seems like the CoinMex exchange shut down, possibly exit scammed. CoinMex provides access to BTC, ETH, USDT and NEO markets. The company was incorporated under the legislation of the Republic of Seychelles in 2018 and is affiliated with NEWEX Technology Co. Ltd. CoinMex is focused on the Chinese market. 
Fatbtc is a blockchain exchange which covers BTC, ETH, USD markets as well as provides pairs against FAT, the platform’s native token. 
Robinhood is a zero commission US based broker, a financial and technology startup. The company was founded in 2014 and is a member of FINRA. Robinhood is designed with newbies in mind, with no commission trading, a simple registration process, and an intuitive interface. No account minimum means newbies can open an account with no upfront investment and purchase fractional shares for as little as $ 1 apiece.