Coinbase - Bitcoin, safe and easy.
Ethereum - Ethereum is a decentralized platform for applications that run exactly as programmed without any chance of fraud, censorship or third-party interference.
Binance - Cryptocurrencies exchange platform
Hyperledger - Hyperledger is a multi-project open source collaborative effort hosted by The Linux Foundation, created to advance cross-industry blockchain technologies.
Poloniex - US-based cryptocurrency exchange with maximum security
BigchainDB - The scalable blockchain database.