Quite a few more related to maths here because I suck at maths and need as much help as I can get.
- Essential Math for Games Programmers - http://www.essentialmath.com/tutorial.htm
- Learning Modern 3D Graphics Programming - http://arcsynthesis.org/gltut/
- 2D and 3D graphics programming techniques from scratch - http://www.scratchapixel.com
- Cheating to make great graphics - http://simonschreibt.de/game-art-tricks/
- Game programming patterns - http://gameprogrammingpatterns.com
- GPU Gems books at Nvidia developer site: GPU Gems 1, GPU Gems 2, GPU Gems 3
- Math programming primers (quite terse, but useful if you need something specific): http://jeremykun.com/primers/
- The guide to implementing 2D platformers - http://higherorderfun.com/blog/2012/05/20/the-guide-to-implementing-2d-platformers/
- http://gamedevelopment.tutsplus.com
- http://www.gamedev.net/page/index.html
- http://aigamedev.com - mostly pay walled, but some of the free articles are excellent.
- http://graphicscodex.com/ - excellent and developing reference for graphics related things.
- http://jcgt.org/read.html?reload=1 - Journal of Computer Graphics Techniques. Aspirational reading. I may even understand some of it one day.
- A penny for your thoughts, a hundred for your life. - http://www.egometry.com/gruedorf/a-penny-for-your-thoughts-a-hundred-for-your-life/
- http://www.altdevblogaday.com - sadly it has imploded for the moment. You can view the archive.org copy here: http://web.archive.org/web/20140718060529/http://www.altdev.co/
- http://www.hobbygamedev.com
(OK, they have affiliate codes, but they're books I actually use. Don't hurt me.)
- Mathematics for Computer Graphics - Excellent explanations of the core concepts.
- Essential Mathematics for Games and Interactive Applications: A Programmer's Guide, Second Edition - Great (although notationally dense) reference. Has brilliant diagrams (I'm better at thinking visually) and links the maths to the code. Comes with a much used notation reference on the inside front cover.
- Physics for Game Developers
- Graphics Shaders: Theory and Practice, Second Edition
- Game Engine Architecture - NOTE: New version due sometime 2014
- Real-Time Collision Detection - This book is brilliant during those times you're caught in a twisty maze of collisions, all alike.
- Real Time Cameras
- Real-Time Rendering
- Behavioral Mathematics for Game AI
- Game AI Pro: Collected Wisdom of Game AI Professionals