We don’t have a GUI builder tool but do recommend the use of standard bit-mapped image development and manipulation tools to create images and then our Screen Layout Utilities for graphic placement. The standard tools include programs such as Adobe Illustrator and Photoshop, or the free program called GIMP (GNU Image Manipulation Program).
Once you have your bitmap images defined, you can use our free Screen Layout Utilities (a plug-in for GIMP) to design your screen layout and to generate a macro that will display on your LCD. We have tutorials for using GIMP to create bitmaps, and for using the Screen Layout Utilities within GIMP. Both tutorials are online in our video library.