Where could I find his code to take a look at? Is there a reputable source or sh...

nickjj · on June 25, 2019

If you're going to go down memory lane, take a detour and read John Carmack's plan files.

It's a daily blog of progress / lessons learned on whatever he was working on during the listed years.

The 1990s is when it was most active.

doomlaser · on June 25, 2019

id Software has a public GitHub and many of their classics are open sourced (Doom, Quake, etc): https://github.com/id-Software/

ltc5505 · on June 25, 2019

Awesome, thank you for the link!

rofo1 · on June 25, 2019

Check out https://github.com/id-Software they've published a lot of things there.

I really liked reading DOOM's source code :)