Embedded Wizard is offering a unique integrated approach to GUI development, with dedicated programming language, generating highly efficient C code, a very low footprint graphics toolkit, an integrated instant prototyper offering the same look and feel on the host machine.
We have used Embedded Wizard for a very large number of embedded projects (
few examples here), following it's evolution to a very modern and robust tool which is today. Our experience included hacking platform packages to fit for various target microcontrollers, building custom widget set, designing applications for better UX, creating automated testing environments for continuous integration and regression tests (both on host and target).
Based on this experience we can highly recommend it as the number one choice for embedded GUI development from very low resource tiny interfaces to high-end itegrated solutions.