Banshee is a high-quality and modern game development toolkit. It provides a high-performance, multi-threaded game engine written in C++14. The engine includes math and utility libraries, Vulkan, DirectX 11 and OpenGL support, handles common tasks such as input, GUI, physics, audio, animation and scripting, and supports many popular resource formats (e.g. FBX, PNG, PSD, TTF, OGG, WAV).
 
Banshee provides an intuitive and customizable editor that can be used to manage assets, build levels, compile scripts, and to test and publish your game. The editor can be extended or customized with scripts to meet the exact needs of your project.

Banshee is a high-quality and modern game development toolkit. It provides a high-performance, multi-threaded game engine written in C++14. The engine includes math and utility libraries, Vulkan, DirectX 11 and OpenGL support, handles common tasks such as input, GUI, physics, audio, animation and scripting, and supports many popular resource formats (e.g. FBX, PNG, PSD, TTF, OGG, WAV).

BansheeEngine - Modern C++14 game engine with Vulkan support, fully featured editor and C# scripting

raylib is a simple and easy-to-use library to learn videogames programming. raylib is highly inspired by Borland BGI graphics lib and by XNA framework and it's specially well suited for prototyping, tooling, graphical applications, embedded systems and education.
 
It supports Hardware accelerated with OpenGL, Unique OpenGL abstraction layer, Full 3D support, VR stereo rendering, Flexible Materials system, supporting classic maps and PBR maps and lot more.

raylib is a simple and easy-to-use library to learn videogames programming. raylib is highly inspired by Borland BGI graphics lib and by XNA framework and it's specially well suited for prototyping, tooling, graphical applications, embedded systems and education.


raylib - A simple and easy-to-use library to learn videogames programming

jMonkeyEngine is a 3D game engine for adventurous Java developers. It’s open-source, cross-platform, and cutting-edge. 3.2.2 is the latest stable version of the jMonkeyEngine 3 SDK, a complete game development suite. The engine is used by several commercial game studios and computer-science courses. 

jMonkeyEngine - A complete 3D game development suite written purely in Java.

An open-source implementation of the Command & Conquer: Red Alert engine using .NET/Mono and OpenGL. It is a Real Time Strategy project that recreates the classic Command & Conquer titles.


OpenRA - Real Time Strategy Game Engine

Godot Engine is a feature-packed, cross-platform game engine to create 2D and 3D games from a unified interface. It provides a comprehensive set of common tools, so that users can focus on making games without having to reinvent the wheel.

Godot - A multi-platform 2D and 3D open source game engine

LimonEngine is a 3D first person shooter engine, developed as a hobby, to acquire a deeper knowledge of 3D game engine programming. It can load a wide variety of models and skeletal animations thanks to Assimp, has realtime directional and point lights/shadows and physics.
 
 you can check out the latest tech demo at <a href="https://youtu.be/XgFlNAy5i0w">https://youtu.be/XgFlNAy5i0w</a>

LimonEngine is a 3D first person shooter engine, developed as a hobby, to acquire a deeper knowledge of 3D game engine programming. It can load a wide variety of models and skeletal animations thanks to Assimp, has realtime directional and point lights/shadows and physics.


LimonEngine - 3D FPS game engine with full dynamic lighting and shadows

openage is a volunteer project to create a free engine clone of Age of Empires II, primarily aimed at POSIX platforms such as GNU/Linux, comparable in its goals to projects like OpenMW, OpenRA, OpenTTD and OpenRCT2.

OpenAGE - Clone of Age of Empires II

Cocos2d-x is a suite of open-source, cross-platform, game-development tools used by millions of developers all over the world. Cocos2d-x allows developers to exploit their existing C++, Lua and Javascript knowledge for cross-platform deployment into iOS, Android, Windows Phone, Mac OS X, Windows Desktop and Linux, saving time, effort and cost. Cocos2d-x is fast, easy to use and loaded with powerful features.

Cocos2d - Cross-platform, game-development tools used by millions of developers all over the world

One framework for creating powerful cross-platform games. The spiritual successor to XNA with 1000's of titles shipped across desktop, mobile, and console platforms. MonoGame is a fully managed .NET open source game framework without any black boxes. Create, develop and distribute your games your way. It is an Open Source implementation of the Microsoft XNA 4 Framework. Our goal is to allow XNA developers on Xbox 360, Windows & Windows Phone to port their games to any platform 

MonoGame - One framework for creating powerful cross-platform games.

Educate and Empower software professionals in open source tools and technologies.

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