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

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

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

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

MIDAS is a multichannel digital sound system. It supports DOS, Win32, and Linux platforms and plays Protracker (.mod), Scream Tracker 3 (.s3m), FastTracker 2 (.xm) and Impulse Tracker (.it) modules, as well as samples and audio streams in raw or WAVE . MIDAS is free for non-commercial usage.

OSDL, a free portable high-level open-source library for multimedia and game programming.

Develops game software technologies which are licensed by primarily by video game companies.

A generic armored combat system.

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

A free library for programming vga games (320x200 pixels with 256 colors) for Linux and FreeBSD in C. [Open source, GPL]

A small, flexible, cross-platform game engine / application framework multi licensed under the LGPL and custom licenses.