Doom (1993 video game)
The ability for others to create custom levels and otherwise modify the game using WAD files turned out to be a popular aspect of "Doom". Gaining the first large mod-making community, "Doom" affected the culture surrounding first-person shooters, and also the industry. Several future professional game designers started their careers making "Doom" WADs as a hobby, among them Tim Willits, who later became the lead designer at id Software.
Doom RPG
Doom RPG is a mobile phone game developed by id Software and Fountainhead Entertainment. It combines the "Doom" first-person shooter franchise with role-playing video game elements. The storyline incorporates many similar events of "Doom 3", but involves different characters than those in the third game.