Black & Decker packs several tools into a single device with the Matrix: a lithium-ion-powered drill with a set of changeable heads, each optimized for a specific task. After a job with the impact driver's 1,300 inch-pounds of torque, pop off the head and replace it with a detail sander—or a jigsaw, a router, a trim saw, or a multi-blade oscillating tool. No power tool has ever put more functions behind a single trigger.* $70 (20V drill); $29–$39 (heads)
*Note that pinning the blade guard out of the way, as we've done here to show the saw's burly teeth, is dangerous and expressly discouraged by the company. Always use tools as directed by the manufacturer.