ECam - Nice, fast and intuitive. A 2D Cad/Cam designed for simple machining operation
AutoCAD MEP - AutoCAD MEP software helps you draft, design, and document building systems.
FreeCAD - An open-source parametric 3D modeler
AutoCAD Arch - Design and document more efficiently with the AutoCAD Architecture toolset, created specifically for architects.
PyCAM - PyCAM is a toolpath generator for 3-axis CNC machining.
AutoCAD Plant 3D - AutoCAD Plant 3D is a BIM software that lets you create, modify, and manage schematic piping and instrumentation diagrams.