lua dev plugin for unreal engine 4 or 5
An isometric arcade-style game of skill, puzzles and exploration
SDL based generic 2D game engine
Updated emulator of Forgotten Realms: Unlimited Adventures
2D Game Engine
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
The imaginary eight-bit machine
A 2D game engine and level editor
A cross platform Lua based game engine
8-bit Graphical API for Java
Build Cross-platform Applications
An open-source, multiplayer fps based on Cube 2 Engine.
2D ARPG Engine
3D .NET engine for Windows, Linux, Mac
Flexible and easy-to-use 2d game engine
Unreal Engine 4 first-person criminal simulator.
Mahasona engine is an open source game engine.
Free strategy browsergame engine.
A generic 2D engine for any kind of game
Multi-threaded 2D Renderer licensed under the Mozilla Public License
2D XNA Game Engine
A world editor for HGE game engine written in python and uses OpenGL.