Yes, both IrisVR and Tekla Structural Designer offer a Free Trial.
IrisVR is designed for Large Enterprises, Medium Business and Small Business.
Tekla Structural Designer is designed for Large Enterprises, Medium Business and Small Business.
The starting price of IrisVR begins at $225/Month, while pricing details for Tekla Structural Designer are unavailable.
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 Tekla Structural Designer includes YouBIM, SkyCiv, BIM Track, Archicad, ALLPLAN, Tekla Structures, Revit LT, Tekla PowerFab, MasterSeries and bimU.io.