2D and 3D Graphics Tools and Resources (mostly free)
Graphics, especially 3D modeling and animation is a potentially very rewarding area of specialization. However, you need to speed some considerable time learning the basics and acquiring the skills to use the tools that are freely available out there.
GIMP - 2D paint program. Totally open source.
Sketchup - Beginners 3D modeling package. Can make simple movies but has no animation, only camera motion. Is a Google product.
Blender - Open Source 3D modeling and animation tool. Able to generate 3D movies.
Wing3D - Open Source 3D animation and modeling software. Expect to spend some serious learning time.
Pov-ray - Command-line ray tracer software that has been around since the beginning of time. Not for the faint-hearted.