s&box is a modern game engine, built on Valve's Source 2
A rhythm game made with HaxeFlixel
A completely free, open-source, 2D game engine
Open source library for N64 development
JavaScript-based game engine designed to empower developers
Fast and lightweight JavaScript game engine built on WebGL and glTF
Descent 3 by Outrage Entertainment
Open source library for creative expression on the web, desktop, etc.
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Go bindings for raylib, a simple and easy-to-use library
MedGui Reborn is a frontend (GUI) for Mednafen multi emulator.
Zoomable user interface (ZUI) with file manager, file viewers and more
Open and edit the archive files used in over 5700 games.
Emulator of the 8-bit computers Sharp MZ-800 / MZ-700 / MZ-1500
SDL based generic 2D game engine
JavaScript framework to build game engines, games, emulators and apps
cross-platform sound-playing package for C++ apps
A c++ public domain audio output class
3D C++ Game Engine - yet another open source game engine
Modern 3D engine and IDE written using C# and C++.
2D Game Engine with Lua Scripting made on top of SFML
A real-time game development platform
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
a 2D Game Development Framework