I usually design all my things in Vetric. Sometimes, I design in Carbide Create. While it is fantastic FREE software that pairs with the Carbide 3D Shapeoko and Nomad, it does have it's limitations. One of these is the inability to export .svg files for use in other CNC cad programs. So far, i've found 3 ways of doing it. None of them are perfect, but it's better than not being able to do it at all.
Option 1. Convert C2D To SVG : An amazing member of the unofficial Shapeoko and Nomad Facebook group created this simple program wrapped in an .html that works in a web browser. It's worked well for simple projects for me but it technically does not support curves. Click HERE to download
Option 2. Cutrocket.com : This is a website built by Carbide 3D as a way to share projects and download completed projects for free. If you upload the .c2d file to cutrocket.com it will make a .svg preview and you can download it in your web browser (if it supports .svg file types)
Option 3. G Code Ripper : This is a free program. You'd have to create your .nc G-code file with Carbide Create, then open it up with G-Code Ripper and export it to .dxf. Then you should be able to open the .dxf with a compatible CAD application.