Are you not using any of the software formats listed here?
Would you still like to save yourself the cost involved in editing gerber and drill data?
It' easy: simply load your gerber and drill data to the gerber viewer software GC-Prevue.
GC-Prevue is available free of charge and can be downloaded from here
We will be happy to answer any questions you may have regarding GC-Prevue! Freecall 0800-389-8560