BTCPay Server - A free and open source server for merchants wanting to accept Bitcoin for their business.
Coinbase - Bitcoin, safe and easy.
CoinGate - CoinGate is a payment gateway for Bitcoin, XRP, Litecoin, Ethereum and 50 other cryptocurrencies.
Binance - Cryptocurrencies exchange platform
ALFAcoins - A secure payment gateway for cryptocurrencies
Poloniex - US-based cryptocurrency exchange with maximum security