dokku-alt!

Tsuru is an extensible and open source Platform as a Service software.

Flynn is an open-source PaaS (Platform-as-a-Service) inspired by Heroku that simplifies deploying and maintaining applications.

Apache Stratos is a highly-extensible Platform-as-a-Service (PaaS) framework that helps run Apache Tomcat, PHP, and MySQL applications and can be extended to support many more environments on all major cloud infrastructures. For developers, Stratos provides a cloud-based environment for developing, testing, and running scalable applications. IT providers benefit from high utilization rates, automated resource management, and platform-wide insight including monitoring and billing.