See wxGUI page.
GNU/Linux
Querying vector map layers (attribute data)
wxGUI: Displaying raster (surface), 2D vector and 3D raster (volume) in the 3D space
wxGUI: Displaying data from North Carolina dataset
wxGUI: Query raster map (using built function or directly using r.what)
Mac OS
Please add some screenshots here...
MS Windows
Running command (r.buffer)
Querying vector map layer (editable mode)