JSC is an Open Source cross-compiler where you can create web applications for Java, JavaScript, Flash ActionScript, PHP and Google App Engine using Microsoft dotNet in C#, VB or F# (F# currently Alpha). And also integrates into the .NET frameworks, Silverlight and ASP.NET. We're currently BETA and would love you to try it out.
Visit our WIKI for more information and tutorials. You can download JSC installer here.
In one solution you can have all three .NET languages. You can use F#, C# or Visual
Basic to implement your client side application for JavaScript, Adoble Flash and
Java Applet.