Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Coinbase - Bitcoin, safe and easy.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Binance - Cryptocurrencies exchange platform
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Poloniex - US-based cryptocurrency exchange with maximum security