Old-school 2D game engine
SDL based generic 2D game engine
2D Game Engine
The imaginary eight-bit machine
Free and Open Game Programming Language for Windows and GNU/Linux
MMIM - Unlimited ideas for Mario Maker Levels!
A 2D tile map editor created using .NET framework.
A C++ library for programmers transitioning from "Game Maker Language"
Delphi-like IDE for cross-platform game development
A DirectX 9 C++ game engine