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Cashierest is one of the leading Korean exchange platforms. There are three platforms powered by the brand: Cashiers is operating cryptocurrency trading, Cappay is for cryptocurrency payments and the third component is represented by PDP brokerage. 
Being relatively new, Safe Currency is a UK-based broker that launched in 2018 and offers its exchange services worldwide.
InstaSwap is a non-custodial cryptocurrency exchange. It allows buying, selling, and swapping cryptocurrencies. The platform is launched by Blocktech Private Company which is registered with Hellenic Capital Markets Commission. This registration is a sign telling us that the company is legit and is subjected to thorough audits. InstaSwap is available for use in the US.