The best color tool is Colorxeha, hands down. Sadly it rarely gets the spotlight or even mention.
Great tip, super handy tool. Added to my list of resources here
Anyone remember Adobe Kuler. Whatever happened to it?
coolors is my favorite one
Nice to see some takes on color pickers I hadn't seen before. Been using one with a similar name to one on the list that I like a lot, if anyone needs an 11th tool to check out :D - Coolors