CloudBees claims to be The Java PaaS company, focusing on creating a full featured as a service platform for Java developers. Even with this in mind, the platform is flexible enough to cover a larger set of runtimes and frameworks.
DEV@cloud Jenkins is the de facto continuous integration server for Java developers, but it is being adopted by other ecosystems as well. With a plugin-based architecture, it can be adapted to build in PHP, Ruby, Python, or any other language.
RUN@cloud gets inspired by this design and evolves to offer a modular architecture, letting developers provide customization on a base system so that they can extend the platform to cover alternate runtimes.
By looking at the ClickStart official wizard, you can see the extent to which this principle was successful. CloudBees can host the Play Framework, Grails, a large set of Java EE/Servlet containers, and also non-JVM based runtimes such as Node.js, PHP, Go, Dart, and Erlang...