[DrShephard]

Have you looked into MonoGame (http://www.monogame.net/)? It is basically a fully open source re-implementation of the XNA framework with support for almost every major platform (iOS, Android, Windows, Windows Phone, Xbox, OS X, Linux, etc.)

[novaleaf]

Yes, MonoGame is good, but at the time I was trying to salvage my XNA team+IP monogame was 2d only. (I think it can do 3d now?) we ended up moving to Unity but this technical roadblock plus some market related ones ultimately led me to abandon gamedev.