As a remodeling contractor, I benefit greatly from a well-designed tool. One tool I especially like is the Tibet Almond Stick. I always have one in my toolbox. It is a remarkable quick fix for minor scratches in wood finishes. One swipe and the scratches disappear (or are greatly diminished!) Great for touching up wood floors, furniture, wood countertops, trim, etc. I have no idea how it works.
A cool tool is anything useful that is superior to comparable items. If you think this tool is inferior suggest a better one. You are welcome to insult a tool, but comments containing insults to individual people will be deleted. Corrections of fact are always welcomed, if stated politely. Recommendations of better tools are dearly wanted and may be elevated to the front page.