In Pictures: 10 open source projects that power th...
Open Languages and Runtimes: PHP, Ruby, Java Script, etc.
Of course, it’s not the languages that are open but the runtime libraries that allow the code to run on the servers. There are enough choices to satisfy just about any developer. The great thing is they all have open source servers or great commercial servers built on the open source.
In Pictures: 10 open source projects that power the Cloud