Deskpcb is a product from IMService. It is a Gerber & Excellon to G-code, Cam program. It is not a controller, but rather writes code for trace isolation milling and hole drilling. The output from DeskPCB is a G-code program ready to run on most any G-code controller. The full capabilities of DeskPCB are also included within DeskCNC.
http://www.imsrv.com/deskpcb
Fred Smith - IMService
http://www.cadcamcadcam.com