Here is a list of other software that I use regularly ourselves. You may find it very helpful too:
- Notepad++ is a free text editor that is way better than regular text editors. This G-Code extension makes editing G-Code much more enjoyable.
- Beyond Compare makes it very easy to compare two different versions of a file (or folder) to each other.
- MachScreen (Program Downloads -> Mach Screen) lets you edit Mach3 screen sets. If it ever messes up and only shows the Properties window, hold down the SHIFT key at startup. All settings will be set to default. Restart MachSreen (you may need to save the screen set???) and it should work correctly again at the next startup.