FreeCAD - An open-source parametric 3D modeler
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
SolveSpace - SOLVESPACE is a parametric 3D CAD program with extrude, revolve, union and difference functions.
SketchUp - 3D for Everyone
SolidWorks - Dassault Systèmes SolidWorks Corp. develops and markets 3D CAD design software, analysis software, and product data management software. SolidWorks is the leading supplier of 3D CAD product design engineering software.
SolidWorks Simulation - Simulation solutions for SOLIDWORKS® provide an easy-to-use portfolio of analysis tools for predicting a product’s real-world physical behavior by virtually testing CAD models.