JSON component for Delphi
3D .NET engine for Windows, Linux, Mac
Rich HTML UI engine for UE4
A game engine written in the D programming language
A Flash Molehill (Stage3D) GPU accelerated 2D game engine
a very lightweight advanced terrain-rendering and 3D map rendering sys
Object-oriented RAD framework for Turbo Pascal 7.0
Plugin based multi-purpose dev tool.
Free-roaming 3D racing game featuring advanced terrain rendering
Cross-platform C framework very compact libraries and tools.
Performance enhancement API for RPG Maker XP, VX, VXA.
Pygrid is an open-source and cross-platform pygame/python 2D engine.
The Flixel Power Tools are a set of plug-ins for Flixel 2.5+
A graphics engine + toolkit.
Graph editing tool
Cross platform 2D game creation framework with Python bindings
Gameserver Installer/Startscript for HL1 and HL2 Games
C-Lesh is a game programming language for 2D games.
Access to Irrlicht Engine SDK from assembler, C, Python, Basic, Pascal
Cross-platform reimplementation of AMOS BASIC (runtime)