The Game Programming Gems series (1, 2, 3, 4 and 6) in PDF

As PCs, game consoles, and graphics cards become faster and more capable, the pressure on game developers to create new and interesting gaming experiences increases: timelines shorten, team sizes grow, and the content benchmark elevates. Despite these pressures, game programmers often find themselves isolated and reinventing the wheel. The Game Programming Gems series is designed to relieve these pressures by providing practical techniques that can be used to solve multiple problems.

If you're a game developer, this is a must have series. These books will help shorten your timelines and ultimately leave you with more time to design new and exciting features for your players to enjoy.