Eternity

Eternity can refer to:
 * Eternity (WAD), a 1994 map set which was considered by Doomworld as one of the Top 100 WADs of All Time.
 * Eternity TC, unrelated to the above, a total conversion that is now abandoned.
 * Eternity Engine, a source port originally developed for the TC but which survived it.
 * Team Eternity, the group that formed to develop the Eternity TC and engine.
 * E4M3: Eternity, a map in megawad Lunar Catastrophe.