Last month, Intel announced plans for a developer kit for building Android and Windows apps with the same code base. The beta version of the Integrated Native Developer Experience (INDE) is now available to download.
INDE runs on Windows 7 and above, works with Visual Studio and Eclipse, and can create Windows 7/8/8.1 or Android 4.3/4.4 apps. You'll need a free Intel Developer Zone account, and the licence for the beta is for a 12-month trial.
Intel INDE Opt-in Free Trial [Intel]