u/EricSchimel

I've got a background in creating CAM software and I've always loved using NCViewer.com for testing.

I wanted something that had a few more features, namely a colored G code editing window, and the ability to show stock getting removed during simulation. I also wanted it to have a more game-like feel.

I finally went ahead and built the thing I wanted: https://g54.app/

I've found it super useful, maybe some folks here will also find it useful too. It's a totally free to use, no account needed. Just drop your G code on it, or write your own!