The Software Toolworks, Inc., was an American software and video game developer based in Novato, California. The company was founded by Walt Bilofsky in 1980 out of his Sherman Oaks garage, which he converted into an office, to develop software for the Heathkit H89 microcomputer. It quickly expanded into video games, releasing Airport and MyChess in 1980; other notable games include Chessmaster 2000, Mavis Beacon Teaches Typing, and Mario Is Missing!.