Yes, both Tekla Structural Designer and Revit LT offer a Free Trial.
Tekla Structural Designer is designed for Large Enterprises, Medium Business and Small Business.
Revit LT is designed for Individuals, Large Enterprises, Medium Business and Small Business.
The starting price of Revit LT begins at $38/Month when Billed Yearly, while pricing details for Tekla Structural Designer are unavailable.
Some top alternatives to Tekla Structural Designer includes YouBIM, SkyCiv, BIM Track, Archicad, ALLPLAN, Tekla Structures, Revit LT, Tekla PowerFab, MasterSeries and bimU.io.
Some top alternatives to Revit LT includes Autodesk BIM 360, YouBIM, BIMx, BIM Track, Vectorworks Architect, Vectorworks Landmark, Navisworks, Archicad, ALLPLAN and bimU.io.