Authoring Tools Framework (ATF) is a set of C#/.NET components for making tools on Windows®. ATF has been used by most Sony Computer Entertainment first party game studios to make many custom tools such as Naughty Dog's level editor and shader editor for The Last of Us™, Guerrilla Game's sequence editor for Killzone™ games (including the Killzone: Shadow Fall™ PS4™ launch title), an animation blending tool at Santa Monica Studios, a level editor at Bend Studio, a visual state machine editor for Quantic Dream, sound editing tools, and many others. ATF has been in continuous development in Sony Computer Entertainment's Worldwide Studios central tools group since early 2005. This figure shows LevelEditor, a powerful tool built with ATF for constructing and editing game levels. LevelEditor is also an open source project, available at LevelEditor. See other tools built with ATF at Gallery and ATF adopters.