Action! is a programming language and development environment with an integrated editor, compiler, and debugger for the Atari 8-bit family of computers. It was created by Clinton Parker, who had previously developed the Micro SPL language with Henry Baker, and released on cartridge by Optimized Systems Software in 1983. Action! was used to develop at least two commercial products—the Homepak productivity suite and Games Computers Play client program—and numerous programs in ANALOG Computing and Antic magazines. The language was never ported to other systems.