SketchUp, FreeCAD, Autodesk AutoCAD, SOLIDWORKS, Autodesk Fusion 360, Autodesk Inventor, Catia, Vectorworks, TurboCAD, nanoCAD, DoubleCAD XT, VARKON, Medusa4, ZW3D, HeeksCAD, progeCAD Smart, BRL-CAD, BricsCAD, CAD Builder, Dune 3D, gCAD3D, LiteCAD, ar-cad freeCAD, NaroCAD, TouchCAD, Punch! ViaCAD Pro, CoffeeSCAD, Pocket Plans, AllyCAD, Punch! ViaCAD 2D/3D, SolidFace, Mapsoft miniCAD, Simulia are some alternatives to Designspark Mechanical.