Capstone Software was a subsidiary of IntraCorp, a Miami-based computer and video game company. Founded in 1984, Capstone created first-person games such as Corridor 7: Alien Invasion, William Shatner's TekWar and Witchaven, and is also known for releasing games based on movie/TV licenses. Capstone's first-person games used the Wolfenstein 3D engine, and later, the Build engine (best known for powering 3D Realms' Duke Nukem 3D).
IntraCorp went bankrupt in 1996 and shut down all their operations, including Capstone Software. Capstone's last game, Corridor 8: Galactic Wars, never left the prototype stage and was never released. Capstone turned into VRTech, which did first person buildouts of new construction condominiums using the Build engine. It eventually closed down.
Read more about Capstone Software: Capstone Games Using The Wolfenstein 3D Engine, Capstone Games Using The Build Engine, Other Games Developed By Capstone, Games Distributed By Capstone