Adobe Photoshop
Description
Photoshop is a professional-grade raster graphics software that can be used to design and manipulate raster images. Raster images can be etched using the laser cutter, or be featured on websites and programs.
Availability
GIMP is open source software, anyone can download and install it for free on their personal computer.
Install Link: http://www.gimp.org/downloads/
Getting Started
Tutorials and information can be found at http://www.gimp.org/docs/.