Yes, both SelfCAD and SketchUp offer a Free Trial.
SelfCAD is designed for Individuals, Large Enterprises, Medium Business and Small Business.
SketchUp is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for SelfCAD Starts at $11.99/Month when Billed Yearly whereas for SketchUp Starts at $119/Year.
Some top alternatives to SelfCAD includes 3D Slash, Clara.io, SketchUp, 3ds Max, ZBrush, formZ, Onshape, BricsCAD and Autodesk Design Review.
Some top alternatives to SketchUp includes Vectary, 3D Slash, SelfCAD, Clara.io, Giraffe, 3ds Max, Archicad, Revit LT and Lumion.