Google Compute Engine provides virtual machines that you can use to run your own Cloud-hosted applications on the same infrastructure that runs all of Google. You can choose from a variety of virtual machines types that best fit your requirements and your budget.

Amazon EC2

Amazon EC2 allows site administrators the ability to scale easily while maintaining manageable costs. Much like any other cloud service the service is a pay as you go service. You select the instance type. They offer various sizes: micro, small, medium, large, etc. The larger the instances the more resources you're provided. It comes at a greater cost. In order to figure out costs, amazon provides a Amazon Web Services calculator to figure out a monthly cost.

Creating an account / logging in

1. Create or Login to the Amazon Web Service Management Console.
2. Amazon offer many different services. Select Amazon EC2.
3. On the left hand side navigation, look for, "Instances" and click on it.

Configuring your instance

1. Select the Linux Amazon Machine Image (AMI) of your preference. (You Can select any but you may need to pay for some futures.)
2. Once you select through the options of your preferred Linux distribution, your instance shall launch.

To get 10 free Drupal sites on Windows Azure follow these easy steps.

If you do not already have a Windows Azure account sign up for a free trial here:
http://www.windowsazure.com/en-us/pricing/free-trial/

Once you have an account, go to https://portal.azure.com.

Openshift is the PAAS cloud provided by Redhat and can serve as a good development ground and also host drupal projects in production.

Since January 2013, the service allows Drupal 7 installation.

Cloud (a.k.a Clanavi) is a set of modules that lets users administer public and private clouds from within Drupal. Clanavi provide users the ability to manage public clouds such as AWS EC2 clouds as well as private clouds like OpenStack and XCP.

Features

Drupal made easy. Cloud services for non-technical end users, with a web interface to quickly create hosted Drupal sites (also known as SaaS publishing platforms).