Yes, both SelfCAD and Adobe Dimension offer a Free Trial.
SelfCAD is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Adobe Dimension is designed for Large Enterprises, Medium Business and Small Business.
Pricing for SelfCAD Starts at $11.99/Month when Billed Yearly whereas for Adobe Dimension Starts at $19.99/Month when Billed Yearly.
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 Adobe Dimension includes Vectary, SelfCAD, SketchUp, Giraffe, 3ds Max, Maya, Cinema 4D, Modo and Spline.