CNCTrans - Shareware application for G-Code editing and RS232 file transfer between PC and CNC controllers.
CutViewer - A program that simulates 2 to 3 axis CNC machines using solid modeling
Discriminator CNC editor. - Discriminator makes CNC files more readable for viewing and printing by allowing the user to format individual codes with any font or color.
EditCNC - Edit CNC has the features needed by CNC programmers for editing CNC G-code files