Yes, both SelfCAD and Modo offer a Free Trial.
SelfCAD is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Modo is designed for Individuals, Freelancers, Medium Business and Small Business.
Pricing for SelfCAD Starts at $11.99/Month when Billed Yearly whereas for Modo Starts at $1,909.
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 Modo includes Mari, 3D Slash, SketchUp, Adobe Dimension, 3ds Max, Maya, Wings 3D, Cinema 4D and formZ.