[Silver][1] runs on Windows and allows you to cross-compile Swift code to Java and .NET.

Alternatively, you can compile Swift code online in a web browser on any platform, including Windows. Try:

 - [RunSwift][2]
 - [SwiftStub][3]


  [1]: http://elementscompiler.com/elements/silver/
  [2]: http://runswiftlang.com
  [3]: http://swiftstub.com