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Re:Id as Super-Ego: The Creation of Duke Nukem 3D (2001) [pdf] by bluedino on Saturday March 11, 2017 @09:24AM (#13845483)
You never hear anything about other 90's 3D engines like Dark Forces, Marathon, or Descent.
Re:Id as Super-Ego: The Creation of Duke Nukem 3D (2001) [pdf] by douche on Saturday March 11, 2017 @09:41AM (#13845540)
There's open-sourced source code available for two of those.

http://www.codersnotes.com/notes/the-man-behind-the-curtain/