Gerbv is an open source Gerber file (RS-274X only) viewer. Gerbv lets you load several files on top of each other, do measurements on the displayed image, etc. Besides viewing Gerbers, you may also view Excellon drill files as well as pick-place file
Very good tool. Pan and zoom are very easy using the mouse. I like the check boxes to enable/disable the layers as required. However, for some reason, i was not able to save the project and retreive it. Maybe is has something to do with the files being saved on a network drive.
Nice software, thanks. But now program crashes, when opening files with unicode symbols in path.