It seems like every home-improvement project requires its own special single-use tool, be it a tile saw, a soldering gun or a drywall sander. If you're taking on a DIY renovation project, you could buy all these things, slowly amassing a garage full of tools you're likely to use only once (a costly proposition, especially if you have to eventually call in professional reinforcements). Or you could pay your $100 annual fee to the Denver Tool Library and borrow from its comprehensive collection of 4,000 items, which range from the relatively simple — screwdrivers and safety goggles — to more specialized saws, circuit testers and aerators. Novices will find helpful advice and classes here to get them started, and gardeners will want to inspect the wide array of landscaping tools available.