I am looking for a framework that allows me to develop modern apps (mobile, web, desktop) all from one Java codebase. I prefer Java because I know it very well, it is already cross-platform and a statically typed language that allows IntelliJ, Eclipse and Netbeans to be better than any dynamically typed scripting language editor could ever be.

Currently my favorite is libgdx. I am planning to use it with IntelliJ Community Edition and with Maven.

By using RoboVM, libgdx even supports iOS.

For user input (forms) libgdx provides the scene2d.ui widgets. I hope that will be sufficient for most of my UIs. Now I just have to get OpenGL to work on my Linux box …