Microsoft has released beta version of Windows Phone App Studio.It is a web-based app creation tool and it gives everyone the ability to create an app, regardless of experience.
Main features:
create an app in 4 simple steps.
web-based application.
export a file in a form that can be submitted for publication to the Windows Phone Store.
templates and plug-ins.
app’s data feed is maintained in the cloud.
developer can download the source code for the app.
optimized for Internet Explorer 10
requires Microsoft Account
