In this post by Yorik, you will find an interesting comparison between the industry leader BIM and it’s open source counterpart. Consider that Yorik is a FreeCAD developer, so he just can’t be completely neutral!
“Last couple of weeks I’ve had the opportunity to do some work in Revit. This was highly welcome as my knowledge of that application was becoming rather obsolete. Having a fresh, new look on it brought me a lot of new ideas, reinforced some ideas I already had, and changed a couple of old perceptions too. So I cannot resist the temptation to do a little comparison between Revit and FreeCAD.”