Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ZoomIt - Presentation utility for zooming and drawing on the screen.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
Virtual Magnifying Glass - Virtual Magnifying Glass, a free, open source, screen magnification program for Windows, Linux, FreeBSD and Mac OS X. Free full version download and instructions for use.
Autodesk Maya - Maya is 3D computer animation software with powerful modeling, rendering, simulation, texturing, and animation tools for artists, modelers, and animators.
Epic Pen - A windows tool for drawing over your desktop and applications