AppJet

AppJet is a website that allows users to create web based applications in their web browser. AppJet was founded by 3 MIT graduates, 2 of whom were engineers at Google prior to AppJet. They launched their initial public beta on December 12, 2007, allowing anyone to create a web app.

AppJet received funding from Y Combinator in the summer of 2007.

"AppJet" also refers to the open-source server-side javascript framework that powers AppJet applications. This is an example of a recent trend in web development to run JavaScript on both the client and the server, allowing developers to code entire web apps in a single language, instead of using a separate language for server-side scripting and client-side scripting.

The virtual machine that powers AppJet apps is currently closed-source, but is reportedly written using Scala (programming language).

Source:
http://en.wikipedia.org/wiki/AppJet

AppJet website:
http://appjet.com/