Tool: Cook's Thesarus
Don't know if this is a "tool" or not but I use it on a regular basis. And it's FREE.
The Cook’s Thesaurus – http://www.foodsubs.com. It’s a great place to learn more on just about any food. I found it when I was trying to find a source for cheese substitutes. For example, enter Gruyere and you are taken to “Semi-Firm Cheeses.” Scroll down to Gruyere and it tells how it’s made and then lists substitutes: Emmentaler OR Jarlsberg OR Appenzell OR raclette OR Swiss cheese. How’s that for help!