NeXT systems were used by professors for scientific and engineering applications, and for developing finished newspaper layouts using News. George Mason University in the early 1990s had a set of NeXT workstations for publishing, as well as Silicon Graphics for CAD/GL and Mathematica for astrophysics. The games "Doom", ', and "Quake" were developed by id Software on NeXT machines. Other games based on the "Doom" engine, such as "Heretic" and ' by Raven Software, as well as "Strife" by Rogue Entertainment, were also developed on NeXT hardware using id's tools.