What are the free solid modeling programs?
Do you mean just for 3-D CAD drawings, or for FEA analysis too?
Equivalents of Inventor, Inventor Fusion, Solidworks and Solidedge.
The first "See Also" link at the wikipedia page takes you to a comparison of similar packages. Several appear to be free, but I don't know if they have the features you want. Had you seen that table before?
Separate names with a comma.