Helpful for finding correct gamma
The documentation is good and gave me an idea of what was going on. You just adjust the gamma while watching some boxes until they melt into the background. A slider instead of a spin button would have been prefered for the adjustment control. I have a hard enough time with 0.1 differences, let alone 0.001! It's amazing what a difference it makes if you have a high gamma like mine (1.9) though.
An open, cross-platform journaling program.
A scientific plotting package.