AutoCAD: The most popular tool you can use
A Great free AutoCAD Drawing Viewer
A free and powerful 3D modeling software
A free, powerful 2D and 3D CAD tool
VideoCAD Starter
VideoCAD Starter - the easiest, low cost version of 3D CCTV Design Software - VideoCAD
Poser
Top class prfessional 3D figure design
Shade 3D for Unity
3D modeling and animation for game development, especially for Unity
Autodesk 123D
A CAD and 3D Modelling Suite to Get You Started