Punch card stock makes amazing paper airplanes, both individually and laminated into larger stock.

Yes, someone please come free us! I am being held hostage by Windows and Autodesk Inventor.

In my case, Inventor and AutoCAD. I hate AutoDesk with the fury of a thousand suns, but FreeCAD just isn’t stable enough.

Oh, and currently needing .NET automatic source generation (long story), which is very difficult to develop on anything other than Windows.