Game Development

Stride (formerly Xenko), a free and open-source cross-platform C# game engine.

3D engine with modern graphics

Flax Engine – multi-platform 3D game engine

Piccolo (formerly Pilot) – mini game engine for games104

a fresh, modern & lightweight HTML5 game engine

Defold is a completely free to use game engine for development of desktop, mobile and web games.

Redot Engine – Multi-platform 2D and 3D game engine

2D JavaScript Physics Engine

Lightweight and modular C++11 graphics middleware for games and data visualization

Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU

Godot Engine official documentation

:video_game: :game_die: A wonderful list of Game Development resources.

Java / JavaFX / Kotlin Game Library (Engine)

Game engine

zig game engine & graphics toolkit

Rust library to create a Good Game Easily

A hand-crafted 2D game library in Go

Cross-platform game engine in Rust.

General purpose 3D and 2D game engine using Go (golang) and Vulkan with built in editor

A fast, scalable, distributed game server engine/framework for C++, include the actor library, network library, can be used as a real time multiplayer game engine ( MMO RPG/MOBA ), which support C#/Lua script/ Unity3d, Cocos2dx and plan to support Unreal.

Tiny fast HTML5 game engine with many features and no dependencies.

Egret is a brand new open mobile game and application engine which allows you to quickly build mobile games and apps on Android,iOS and Windows.

The multiplayer game engine

A powerful free cross-platform RTS game engine. - Report issues at https://springrts.com/mantis/

Terasology - open source voxel world

Godot Minimal Theme

A wonderful list of Game Development resources.

3D C++ Game Engine - yet another open source game engine

The Open Toolkit library is a fast, low-level C# wrapper for OpenGL, OpenAL & OpenCL. It also includes windowing, mouse, keyboard and joystick input and a robust and fast math library, giving you everything you need to write your own renderer or game engine. OpenTK can be used standalone or inside a GUI on Windows, Linux, Mac.

Improved version of the X-Ray Engine, the game engine used in the world-famous S.T.A.L.K.E.R. game series by GSC Game World. Join OpenXRay! ;)