3D Realms Entertainment ApS is a video game publisher based in Aalborg, Denmark. Scott Miller founded the company in his parents' home in Garland, Texas, United States, in 1987 as Apogee Software Productions, to release his game "Kingdom of Kroz". In the 1980s and 1990s, the company popularized the shareware distribution model for video games and created successful game franchises, such as "Duke Nukem". Apogee adopted the trading name 3D Realms in 1996; the "Apogee Software" name and logo were sold to Terry Nagy in 2008, using which he established Apogee Software, LLC.