Apogee Software, Ltd. is a standing but not operating publisher and video game developer based in Garland, Texas established in 1987. It is best known for popularizing the shareware distribution model and as the creator of franchises on the PC such as Duke Nukem, and also the publisher of other franchises such as Commander Keen and Wolfenstein 3D.
The original Apogee Software was established in 1987 as Apogee Software Ltd. In 1994, Apogee established its 3D Realms brand for publishing 3D video games distributed by the company. By 1996, with 3D video games dominating the industry, the Apogee name was dropped and all games by the company were published under the 3D Realms brand, although the company's legal name remains Apogee Software, Ltd.