[CAD_CAM_EDM_DRO]Link emulator

I need to design & simulate a set of links or arms and I am looking for suitable software.
I have seen Working model but it is unnecessarily complex for this simple application (and it has too many zeros in the price
tag).

Any suggested low cost alternatives?
Ideally, some type of drop-in into AutoCad to keep the learning time to a minimum.
TIA
Bertho Boman
Vinland Corporation