Non-commercial only
Stick-figure webcomic of science and coding humor
Randall Munroe · xkcd.comGet art, sound and fonts for your game. Usage terms differ per asset — please check them. 2 visitors this month
Why upload here directly?
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Non-commercial only
Design patterns for game programmers
Robert Nystrom · gameprogrammingpatterns.comBuild a roguelike in Rust, step by step
Herbert Wolverson · bracketproductions.comEngine-agnostic level design for 3D games
The Level Design Book 편집진 · leveldesignbook.com
Non-commercial only
Classic FPS engines dissected, free PDFs
Fabien Sanglard · fabiensanglard.net
Non-commercial only
The classic manual for writing text adventures
Graham Nelson · inform-fiction.org
Non-commercial only
3D game math primer, free to read in full
Fletcher Dunn, Ian Parberry · gamemath.com
Non-commercial only
Textbook on procedural generation in games
Noor Shaker, Julian Togelius, Mark J. Nelson · pcgbook.com
Non-commercial only
Free dark-fantasy RPG built for solo play
Shawn Tomkin (Tomkin Press) · tomkinpress.com
Non-commercial only
A printable six-suit deck for many games
P.D. Magnus · decktet.com“Linked” cards only introduce assets hosted on other sites. Download from the original; the original page's terms are authoritative.