FreeCAD is a general purpose open source parametric 3D CAD modeler licensed under the LGPL License. FreeCAD is aimed directly at mechanical engineering and product design but, being very generic, also fits in a wider range of uses around engineering, such as architecture, finite element analysis, 3D printing, and other tasks.
Vector drawing
Draw anything, animate stuff and do many more things with this amazing peace of software. Also available on Android.
You like 3d drawing, you like LEGO®, you might like to check this out.
Like to make Sprites? This is it. Also very useable for game making images.