Silas Weir Mitchell, an American physician

Stanford Watershed Model, a hydrology transport model

Nikon's Silent Wave Motor rapid autofocusing lens technology.

Silas Weir Mitchell (actor), an American actor

swm Selbourne Window Manager, a free X Window manager

SWM, Speedy Working Motors: a manufacturer of off-road motorcycles in the 1970s and 1980s

Stormwater management, an aspect of Civil engineering which designs systems to handle precipitation

Star Wars Miniatures, a tabletop game by Wizards of the Coast