ZofzPCB - free 3D Gerber Viewer
"ZofzPCB"has Rafal Paltso a handy tool designed to represent board layouts (such as Gerber files) appealing.
The here tested version 0.4.0000 apparently has problems with cutouts in the dimension layer (*.)GKL, *.GML) if it were constructed from Eagle 5.10.
To insert the following two color presets, "OSHPark" & "MultiCB" - in: