Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
DigitalOcean - Simplifying cloud hosting. Deploy an SSD cloud server in 55 seconds.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Amazon EC2 - Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.
Codeship - Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.
MacStadium - MacStadium offer Mac colocation and dedicated server rentals plus VMware Mac Pro private cloud environments for large-scale iOS app