I have been working on a little side project to add a GCode Viewer to the DWC 2.0. I don't know if anyone would be interested in something like this but I have a little video showing it to see if there'd be interest in this.
https://www.youtube.com/watch?v=rlreuMFQjJ8
Update
The newest versions of a new plugin for DWC 3.2 is a available here.
Been a while since I provided an update. I have been working toward getting my viewer converted to a plugin in 3.2. Here's a little sneak peek of where it is at today.
For anyone who is building and running the latest beta 3.2 you can install and test the plugin. Enjoy!
https://github.com/Sindarius/DWC_GCodeViewer_Plugin/releases/tag/0.5.0
Just finished implementing object cancelling in the 3d viewer.
https://github.com/Sindarius/DWC_GCodeViewer_Plugin/releases/tag/0.6.0
If any of you happen to be using my Gamepad Jogger plugin with the CNC build I have a new version which allows you to bind keyboard keys to commands as well.
https://github.com/Sindarius/DWC_GamepadJogger_Plugin/releases/tag/0.2.0
I've been playing around with the code a little bit while I wait for a plugin system to be put in place. Recently added the ability to change the bed size and have the release on GitHub for anyone who wants to play with this. I use it fairly often at this point.
https://github.com/Sindarius/DuetWebControl/releases
@cjm The structure of the spindle in the object model has changed so I will be making some adjustments to fix it.
Did some mobile tweaks in a new release that is now availabe on github.
https://www.youtube.com/watch?v=XxkoAm-oLH0&feature=youtu.be
I plan to address the ui scaling in a future release.
@Thalios Give 0.7.6 a shot. I have reworked a chunk of the bed logic so it should pick up the axes limits from the object model now.
https://github.com/Sindarius/DWC_GCodeViewer_Plugin/releases/tag/0.7.6
Also added build volume. It's a little odd for deltas but it you look top down it works well enough for now.
I could absolutely have the layer slider automatically move based on the current printing layer height. It'd probably take a little more thought but I could have it track to the current line if I spent some time on it. The initial purpose of the work I did was to be able to quickly and easily visualize how multi-material prints would look based off set colors. But there is no reason I can't make it do more 
For larger files it does switch to a line render mode just because WebGL starts to choke after so many polygons.
@chimaeragh workzero.g would essentially be a macro and the button would just calling that macro.
@chimaeragh I saw the GitHub request and a macro would be the best way to handle it given the configurations people could have.
I thought about making a config where you could set axis order and if it needs to move to min/max first but it would probably end up complicated.
I’ll see what I can get in.
@paulg4h let me take a look but I imagine that should not be a problem.
@diamondback I am looking into this issue. Where and how are you setting the offsets on your print so I can try to recreate.
@jay_s_uk The DWC-CNC version will show the CNC dashboard if set to Laser mode.
@crossbow I have found the issue and am going to have a new release available in a little while. Will edit this post when complete.
Edit:
New version is here https://github.com/Duet3D/DWC-CNC/releases/tag/3.3.0-CNC06
@mdhazell In the short term you can probably just open up the zip file and go into the plugin.json file and change it to 3.3. I'll look at updating that plugin as well.
@mdhazell That's a different plugin that does something similar.
https://github.com/Sindarius/DWC_GamepadJogger_Plugin
This one lets you use keyboard or a gamepad to perform actions. You do have to configure this one.
There are no settings for it right now. The jog control appears under the control section. What are you trying to set?
I do know that the theme needs to be fixed on it for light them.
@mdhazell Did you turn on the plugin in Machine-Specific Plugins tab on the Machine-Specific settings?