The plasma torch was a Starfleet cutting tool that used a stream of plasma to cut through solid objects.

Although a tool, Lieutenant Malcolm Reed used one to burn eyes and a mouth to a snowman on the Archer's Comet, and then stuck it in to serve as a nose. (ENT: "Breaking the Ice")

When Enterprise discovered a Xindi-Insectoid shuttlecraft in January 2154, Trip had "half a mind to take a plasma torch" to it. (ENT: "Hatchery")

Reed also used a plasma torch to reach a jammed access port on Enterprise's outer hull in February 2154. (ENT: "The Forgotten")

In an alternate timeline in 2165, Trip ordered Reed to use a plasma torch to "slice Yerdrin Lek's ship into neat little pieces" as a means of coercing the truth out of him. (ENT: "Twilight")

In 2369 Commander Riker had to have treatment for a facial injury sustained during rehersal for a play, Frame of Mind postponed after another crew member entered sickbay after a plasma torch had exploded in his face. (TNG: "Frame of Mind")

In 2375, the USS Voyager received a distress call from the lost USS Equinox. On a search and rescue mission aboard the Equinox, Ensign Harry Kim had to use a plasma torch to remove debris from a pinned down Noah Lessing. (VOY: "Equinox")