Quadrup3D was designed in Solidworks, it's what I'm best at and it's available through my school making it pretty convenient. I love it, but it's not exactly accessible given the high price tag. Anyone who's downloaded some cool thing from Thingverse has probably run into the annoying problem of not being able to easily modify the design. To make sure everyone can change or contribute, I'm going to be porting the whole thing over to Autodesk Fusion 360 which is available for free to hobbyists. Hopefully this won't take long!