Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.
IBM Bluemix - IBM Bluemix is an open-standard, cloud-based platform that enables users to build, manage, and run apps on mobile, web, and smart devices.
Scaleway - Scaleway is the world's first Cloud Computing IaaS platform that offers ARM BareMetal SSD servers, starting at €0.006 on an hourly basis.
Amazon EC2 - Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.
CloudSigma - CloudSigma is increasingly being recognized for its advancement of the cloud IaaS industry.
DigitalOcean - Simplifying cloud hosting. Deploy an SSD cloud server in 55 seconds.