Full development system for 2D games (arcade, side scrollers, platform games), using the functional language Clean.

Offers a freeware Java software capable of building and running multiplayer adventure games, playable with any browser. Several multiplayer games are available for free as a demo.

A complete toolkit to create games for handheld devices. [Free for non-commercial use]

A Java library for creating 2D games. [Freeware]

A C/C++ library for creating hardware accelerated 2D games for Microsoft Windows. It provides minimal yet fully functional and flexible set of routines for handling graphics, sound and input. [Shareware]

A (commercial) free and open source realtime 3D graphics engine and SDK.

A C++ based library to load/save game-related file formats, such as graphics, sound and 3d meshes.

Impact, modelling and car library for games. Includes screenshots and downloads of demos. [Commercial]

A multi-platform game development library. Currently is works on Linux and Win32. [Open source, LGPL]

A game orientated networking API that is a wrapper for Berkely Sockets on Windows, Linux, and Unix. [Commercial]