iscriminator is free.
It's a gcode file editor with many of the features you would expect from a CNC editor but Discriminator has additional features
that set it apart from the rest.
Discriminator V2.0
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Backplotting.
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Multi-level undo/redo.
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Multi viewport viewer.
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Bi-directional graphical selection. Gcode-to-graphics and graphics-to-gcode.
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Customizable toolbars.
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Code Explorer provides a customizable outline of the gcode file.
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Graphical and textual compare.
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Exceptional printing features.
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Plug-In support. Write your own custom commands using Microsofts free version of
VB.NET!
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Macro debugger for Fanuc style Macro-B code!