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Re:DOOMBA by merlincorey on Monday December 24, 2018 @10:04PM (#18755606)
It has been open source for a long time and many great write ups and explorations of said source have been available.

It is known to be high quality and hackable, by orignal design and later hard work of fans.

Re:DOOMBA by jonathanfoster on Monday December 24, 2018 @11:28PM (#18755897)
By far the best write up is Fabien Sanglard’s Doom Game Engine Black Book [1]. The amount of detail and depth is just incredible.

[1] http://fabiensanglard.net/gebbdoom/