Flax Engine, multi-platform 3D game engine
Powerful, mature open-source cross-platform game engine for Python
A game framework written with osu! in mind.
Recreation of the classic Grand Theft Auto III game executable
3D Procedural Game Engine Using OpenGL
A retro game engine for Python
Stride (formerly Xenko), a free and open-source cross-platform C# game
High performance UI layout library in C
3D game engine/framework in C, with Luajit and Python bindings now
The Tiny JavaScript Game Engine That Can!
Open source library for creative expression on the web, desktop, etc.
A .NET ascii/ansi console engine written in C# for MonoGame and XNA
Every creative journey starts with Unity Hub
Visual Basic 6 2D online adventure game engine
Haskell game engine library for roguelike dungeon crawlers
Rust library to create a Good Game Easily
A simple math library for games and computer graphics
A game engine for console based text games
Opensource crossplatform Fallout 2 game engine writen in C++ and SDL
A fork of dhewm3 with an emphasis on modernisation and vanilla Doom 3
Amazon Lumberyard is a free AAA game engine
RPG dice roll simulator for vintage Tandy TRS-80 100/102/200 laptops
A cross platform Lua based game engine
Opensource Game Studio
Planimeter Game Engine 2D - LÖVE-based game engine for Lua