Yes, both IrisVR and Vectorworks Architect offer a Free Trial.
IrisVR is designed for Large Enterprises, Medium Business and Small Business.
Vectorworks Architect is designed for Medium Business and Small Business.
Pricing for IrisVR Starts at $225/Month whereas for Vectorworks Architect Starts at $3,715.
Some top alternatives to IrisVR includes BIMx, BIM Track, Vectorworks Architect, Vectorworks Landmark, Archicad, Revit LT, Vectorworks Designer, SENTIO VR, Enscape 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.