| KiCAD Layer Name | Gerber Name | Gerber Extension |
|---|---|---|
| F.Cu | Top Layer | .gtl |
| B.Cu | Bottom Layer | .gbl |
| F.Paste | Top Paste | .gtp |
| F.SilkS | Top Overlay (silk screen) | .gto |
| B.SilkS | Bottom Overlay (silk screen) | .gbo |
| F.Mask | Top Solder Resist | .gts |
| B.Mask | Bottom Solder Resist | .gbs |
| Edge.Cuts | Edges (board outline) | .gm1 |
http://tinymicros.com/wiki/Protel_Gerber_Layer_Names https://code.google.com/p/opendous/wiki/KiCADTutorialCreatingGerberFiles http://daycounter.com/LabBook/Protel-Layer-File-Extensions.phtml
- http://mayhewlabs.com/webGerber/ - WebGL 3d viewer
- http://svgerber.cousins.io/ - SVG viewer