Over at MediaChance, the specialty imaging software company that brought us Dynamic Photo HDR, they've been getting into Orbs lately. The newest version of DPHDR has a "Light Tuner" and a Grayscale Channel mixer that are both Orbs.
And now they've just released "Orbis Luminum." They call it "experimental software." It will work with RAW or JPEG images, and there's only one control: The Orb. That's it. Spin the orb, see what it does, and click Process if you like the results.
There's a free trial, and if the Orb moves you, the full version is only twenty four bucks.