List of open latform as a service PaaS

Here is a list of open source clouds that you should consider if you are starting a new project:
1) Cloud Foundry from VMware
Cloud Foundry is an open platform as a service and makes it faster and easier to build, test, deploy and scale Java and .Net applications.
It is an open source project and is available through a variety of private cloud distributions and public cloud instances, including CloudFoundry.com. See more about what is PaaS in my blog.

2) OpenShift is a free, auto-scaling platform-as-a-service for Java, Ruby, PHP, Perl and Python applications. If the time is important for you you can just upload the code in production. Openshift is Scalable and you do not need any additional coding to scale your code up. OpenShift has support for open source Java, PHP, Ruby, Python, Perl and much more.

3) CloudBees.com

This is another Platform as a service that lets you build, test and deploy Java web applications in the cloud. The price is reasonable however I suppose that this is more affordable to rey CloudFoundry and OpenShift. This is not Open Platform as a service. You can only deply Java web applications.

4) Google App Engine - you can develope, build, maintain, scale your web applications in Java, Python and Go. You can set up a daily budget to manage your billing. The App Engine have some restriction that you can visit this page

5) Amazon Web Services AWS   EC2 - there is less restrictions on Amazon in comparison to Google App Engine however watch up for the increasing costs if you use any sources.

6) Microsoft Azure - You can try Windows Azure however their pricing is horrible and this is not an alternative to innovative developers. Just for companies that heavily invested in Windows products and would like to skip their infrastructure.