When the Worx JawSaw debuted, we praised it as a safer, smarter chain-saw alternative. Its steel teeth hold branches up to four inches wide while an enclosed six-inch blade makes clean, quick cuts without endangering limbs. The latest iteration, the 20V 2.0, is even better, powered by a lithium-ion battery good for 20 minutes of cord-free use. [$160; worx.com]