Development of Doom
The development of "Doom", a first-person shooter video game by id Software, began in November 1992 and continued until the game was released in December 1993. Seven people worked on "Doom", which is considered one of the most significant and influential titles in video game history. The initial development team was programmers John Carmack and John Romero, artists Adrian Carmack and Kevin Cloud, and designer Tom Hall; late in development Hall was replaced by Sandy Petersen and programmer Dave Taylor was added to the team. The music and sound effects were created by Bobby Prince.
Brutal Doom
Brutal Doom is a gameplay mod for the video game "Doom". Developed by the Brazilian modder Marcos Abenante, a.k.a. Sergeant_Mark_IV, it adds numerous features to the gameplay. The mod has been in development since 2010, and continues to release new updates. The most current version is v21b.