Assets

Open Game Art
Various game assets
https://opengameart.org/

Free3D
Free 3D models
https://free3d.com

Spriters Resources
Sprites from existing games (for inspiration)
https://www.spriters-resource.com/

Pixel-art icons
Pixel-art icons from devianart

Game icons
Free game icons
https://game-icons.net/

Blender models
Free Blender models
https://www.blender-models.com/

Reiner's Tilesets
Free Tilesets
https://www.reinerstilesets.de/

Vecteezy
Free Vector Art
https://www.vecteezy.com/

Texture King
Free Textures
https://www.textureking.com/

GameSounds.xyz
Royalty-free sounds
https://gamesounds.xyz/

FreePd
Public Domain Music
https://freepd.com/

FreeSFX
Free Sound Effects
https://www.freesfx.co.uk/
Portals

Itch.Io
For sharing free indie games
https://itch.io/

Games.cz
CZ portal with latest news from Game Industry
https://games.tiscali.cz/

Game Developer
Former Gamasutra, portal for gamedev articles
https://www.gamedeveloper.com/

Unseen
Never released games
https://www.unseen64.net/

How Long To Beat
How long it takes to beat a game DB
https://howlongtobeat.com/

Game Clones
List of open-source clones
http://osgameclones.com/
Books

Game Engine Architecture (3rd ed.)
Json Gregory, 2018

Game Programming Patterns
Robert Nystrom, 2014

Game Sound
Karen Collins, 2008

Essential Mathematics for Games and Interactive Applications
Van Verth, 2008

Procedural Generation in Game Design
Tayna Short, Tarn Adams, 2017

Game Physics Engine Development
Ian Millington, 2010

Programming Game AI by Example
Mat Buckland, 2005

Artificial Intelligence: A Modern Approach (4th ed.)
Stuart Russell, 2020

Multiplayer Game Programming
Joshua Glazer, 2015

Level Up! The Guide to Great Video Game Design
Scott Rogers, 2014

Theory of Fun for Game Design
Raph Koster, 2004
