WinPedit 

WinPedit is the Windows version of the DOS era Pedit program. Once acquainted with a good DOS editor, it will out perform any Windows editor. WinPedit is such a good editor.
edit text editor c thesaurus spelling checker

CNC Syntax Editor 

CNC Syntax Editor is a popular tool for writing, editing, and studying CNC programs with G codes. It has a comfortable and intuitive interface both for beginners and advanced programmers. CNC Syntax Editor is deceptively simple, but truly powerful.
cnc editor cnc edit g code g code edit nc edit axis