There is a new Humble Bundle of interest to game developers, the Game Architecture, World Building and AI Humble Bundle. This bundle is a set of e-books in PDF format from Taylor & Francis (mostly CRC Press) on a wide variety of game development topics, but especially game design, world building, art and AI programming.
As with most Humble bundles it is organized into tiers:
1$ Tier
Pixel Art for Game Developers
The Publishing Challenge for Independent Video Game Developers
The Fundamentals of C/C++ Game Programming
Game AI Pro
Mid Tier
The Golden Age of Video Games
Environment Art in the Game Industry: A Guide to Rich and Realistic Environments using Substance Designer
Surviving Game School and the Game Industry After That
Dramatic Storytelling & Narrative Design
25$ Tier
Game Design Deep Dive Platformers
Once Upon a Pixel
Animation Writing and Development
Character Development and Storytelling for Games
History of Digital Games
Game Production Prototyping and Producing Your Board Game
The Indie Game Developer Handbook
They Create Worlds
Make it HUGE in Video Games
Workflow: A Practical Guide to the Creative Process
Passion and Play: A Guide to Designing Sexual Content in Games
Game Design Deep Dive: Free to Play
The Golden Age of Video Games: The Birth of a Multibillion Dollar Industry
As with all Humble Bundles you decide how your purchase is allocated between Humble, charity, the publisher and if you so choose (and thanks so much if you do!) to help support GFS using this link. You can learn more about the Game Architecture, World Building and AI Humble Bundle in the video below.