Raven Software is an American video game developer founded in 1990, known for creating games across various genres. Initially, they gained recognition for their work on the Heretic and Hexen series, which were popular first-person shooters in the 1990s. In 1997, Raven Software was acquired by Activision, a major video game publisher. Since then, they have contributed to several high-profile franchises, including the Call of Duty series, where they have worked on various titles and expansions, enhancing the gameplay experience for millions of players worldwide.