Railo - Accelerate Your Web Development
Railo is a fast, free, open-source cfml (coldfusion) server that gives unparalleled power to your web applications. Railo Server brings the best of both worlds, a simple markup language, CFML, and blazing fast performance. This great combination means you can both deliver the application in record time and that your application can deliver too.
It has support for Java, JSP, .NET, PHP languages.