Well, the lite version of DaVinci Resolve that is. For those that may not know, DaVinci Resolve is a benchmark color grading system. If you have the budget, you can get a package with a the fancy control surface for around $30,000. If you plan to hire a professional colorist, this is practically a must. If however you want to experiment with your own color grading, this is pretty hard to beat. Not only that, but Resolve Lite also functions as a basic NLE to boot.
I ran across a well done tutorial on the Youtubes below.