Yes, both Navisworks and Vectorworks Architect offer a Free Trial.
Navisworks is designed for Large Enterprises, Medium Business and Small Business.
Vectorworks Architect is designed for Medium Business and Small Business.
Pricing for Navisworks Starts at $78/Month when Billed Yearly whereas for Vectorworks Architect Starts at $3,715.
Some top alternatives to Navisworks includes Autodesk BIM 360, YouBIM, BIMx, BIM Track, Vectorworks Architect, Vectorworks Landmark, Archicad, Revit LT and bimU.io.
Some top alternatives to Vectorworks Architect includes YouBIM, SketchUp, BIMx, BIM Track, Vectorworks Landmark, Navisworks, Archicad, Revit LT, Vectorworks Designer and bimU.io.