Torque 3D is the best full source, open source solution available. orque 3D comes equipped with a full suite of tools to allow your team to excel and produce high-quality games and simulations. Its feature include World Editing Suite, Lighting, Programming, Terrain, Asset pipeline, Networking.

Torque 3D - Game Engine

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.

An InfiniMiner/Minecraft inspired game.If you downloaded the Minetest Engine source code in which this file is contained, you probably want to download the Minetest Game project too.

Minetest - Infinite-world block sandbox game engine and game with survival and crafting

Panda3D is a game engine, a framework for 3D rendering and game development for Python and C++ program. It  featues include Exposes Full Power of Graphics API,  Powerful interface between shaders and engine,  Support for tessellation and compute shaders,  Fullscreen filters such as Bloom, Cartoon Inking, Volumetric Lightning, Blur/Sharpen and Ambient Occlusion, as well as the ability to use your own, Get models from your 3d modeller to Panda3D easily, Several options for adding sounds, physics simulation to your game. 

panda3d - Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU

The Starling Framework allows you to create hardware accelerated apps in ActionScript 3. The main target is the creation of 2D games, but Starling may be used for any graphical application. Thanks to Adobe AIR, Starling-based applications can be deployed to mobile devices (iOS, Android), the desktop (Windows, OS X), and to the browser (via the Flash plugin).
 
While Starling mimics the classic display tree architecture of Adobe AIR/Flash, it provides a much better performance: all objects are rendered directly by the GPU (using the Stage3D API). The complete architecture was designed for working well with the GPU; common game development tasks were built right into its core. Starling hides Stage3D internals from developers, but makes it easy to access them for those who need full performance and flexibility.

The Starling Framework allows you to create hardware accelerated apps in ActionScript 3. The main target is the creation of 2D games, but Starling may be used for any graphical application. Thanks to Adobe AIR, Starling-based applications can be deployed to mobile devices (iOS, Android), the desktop (Windows, OS X), and to the browser (via the Flash plugin).

Starling Framework - The Cross Platform 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

Stockfish plays better and faster than humans. And it's one of the strongest chess engines in the world, appearing near or at the top of most chess engine rating lists. 

Stockfish  - A powerful, open-source chess engine

Lila (li[chess in sca]la) is a free online chess game server focused on realtime gameplay and ease of use. It features a search engine, computer analysis distributed with fishnet, tournaments, simuls, forums, teams, tactic trainer, a mobile app, and a shared analysis board. The UI is available in more than 80 languages thanks to the community.

lichess - Online Chess Game Server

Lutris helps you install and play video games from all eras and from most gaming systems. By leveraging and combining existing emulators, engine re-implementations and compatibility layers, it gives you a central interface to launch all your games.
The client can connect with existing services like Humble Bundle, GOG and Steam to make your game libraries easily available. Game downloads and installations are automated and can be modified through user made scripts. Game downloads and installations are automated and can be modified through user made scripts.

Lutris is an open gaming platform for Linux

Lutris - Open Gaming Platform for Linux

The Delta Engine is allows you to develop applications and especially games for many different platforms (mobile, tablets, console, PC) completely under Windows with .NET by using your favorite tools. It is free to use on Windows, Open Source and written in C# (.NET). Supported Frameworks: GLFW, OpenTK, SharpDX, SlimDX, XNA and MonoGame.
 This release uses NuGet to get all required dependencies, except MonoGame (you can also get the Delta Engine itself via NuGet). Only the .NET Framework 4 Client Profile is required.
 
Several full fetched games have been developed with the Delta Engine. <a href="http://soulcraftgame.com">SoulCraft, SoulCraft 2, Heroes of Soulcraft</a>&nbsp;(12+ million downloads on Android, iPhone, iPad, Amazon, Ouya, Windows 8, Windows Phone 8)&nbsp;and <a href="http://store.steampowered.com/app/207730/?l=english">Arena Wars</a>&nbsp;(PC) are some examples.

The Delta Engine is allows you to develop applications and especially games for many different platforms (mobile, tablets, console, PC) completely under Windows with .NET by using your favorite tools. It is free to use on Windows, Open Source and written in C# (.NET). Supported Frameworks: GLFW, OpenTK, SharpDX, SlimDX, XNA and MonoGame.

DeltaEngine - Open Source Multiplatform Game Engine, C# OpenGL Version (custom wrapper) including the Editor

chessboard.js is a standalone JavaScript Chess Board. It is designed to be "just a board" and expose a powerful API so that it can be used in different ways. You can use chessboard.js to show game positions alongside your expert commentary, to have a tactics website where users have to guess the best move, 

chessboardjs - JavaScript Chess Board

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

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

OSTINATO is a chess library that runs on the server (Scala), on the browser (ScalaJS) and on the REPL. It supports the following Chess notations (with variants): PGN, Algebraic, Figurine, Coordinate, Descriptive, ICCF, Smith and FEN. 

OSTINATO - A chess library that runs on the server (Scala), on the browser (ScalaJS) and on the REPL

BZFlag is an Open Source OpenGL multiplayer multiplatform Battle Zone capture the Flag game.  At its heart, the game is a 3D first person tank simulation where opposing teams battle for dominance.  


BZFlag - 3D multi-player tank battle game 

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