A cool tool can be any book, gadget, software, video, map, hardware, material, or website that is tried and true. All reviews on this site are written by readers who have actually used the tool and others like it. Items can be either old or new as long as they are wonderful. We post things we like and ignore the rest. Suggestions for tools much better than what is recommended here are always wanted.
JarPopThe JarPop jar opener is the best five-dollar gizmo I've ever bought. It's what I gave my mother for Christmas last year. It's a beautifully simple bottle-cap-opener for lidded jars. It breaks the seal on a jar of applesauce (or anything else), and then the lid twists right off. I'm a little embarrassed how strongly I feel about it.