[amatecha]

I just wanted to drop in and point out this author has published a couple excellent books analyzing the engines behind the popular first-person-shooter games Wolfenstein 3D[0] and DOOM[1]. Excellent reads if you're interested in the inner workings of these games (and by extension, others like them)! (Yes, he links the DOOM one in the article, but wanted to call them out specifically as being awesome ;))

[0] http://fabiensanglard.net/gebbwolf3d/ [1] http://fabiensanglard.net/gebbdoom/