Browse free open source C# Game Engines and projects below. Use the toggles on the left to filter open source C# Game Engines by OS, license, language, programming language, and project status.

  • Build AI Apps with Gemini 3 on Vertex AI Icon
    Build AI Apps with Gemini 3 on Vertex AI

    Access Google’s most capable multimodal models. Train, test, and deploy AI with 200+ foundation models on one platform.

    Vertex AI gives developers access to Gemini 3—Google’s most advanced reasoning and coding model—plus 200+ foundation models including Claude, Llama, and Gemma. Build generative AI apps with Vertex AI Studio, customize with fine-tuning, and deploy to production with enterprise-grade MLOps. New customers get $300 in free credits.
    Try Vertex AI Free
  • Easily Host LLMs and Web Apps on Cloud Run Icon
    Easily Host LLMs and Web Apps on Cloud Run

    Run everything from popular models with on-demand NVIDIA L4 GPUs to web apps without infrastructure management.

    Run frontend and backend services, batch jobs, host LLMs, and queue processing workloads without the need to manage infrastructure. Cloud Run gives you on-demand GPU access for hosting LLMs and running real-time AI—with 5-second cold starts and automatic scale-to-zero so you only pay for actual usage. New customers get $300 in free credit to start.
    Try Cloud Run Free
  • 1
    San Andreas Unity

    San Andreas Unity

    Open source reimplementation of GTA San Andreas game engine in Unity

    San Andreas Unity is an open-source reimplementation of GTA San Andreas game engine in Unity. This won't be a complete reimplementation, but the focus is on gameplay features, multiplayer, and creating a framework that will allow easy game extension and unlimited modding possibilities. When running for the first time, the game will ask you for a path to GTA installation. You need to own GTA in order to play it. The game is tested on Linux, Windows, Mac, and Android. It supports both Mono and IL2CPP scripting backends, so it can be built for any platform that Unity supports, provided that you can copy PC version of GTASA to target device. Game fully works in multiplayer. You can start the game as dedicated server, as a host (server & client at the same time), or you can connect to a server. This works on all supported platforms, which means you can start a host even on Android device.
    Downloads: 28 This Week
    Last Update:
    See Project
  • 2
    osu!framework

    osu!framework

    A game framework written with osu! in mind.

    A game framework written with osu! in mind. If you are interested in creating a project using the framework, please start from the getting started wiki resources (or jump straight over to the project templates). You can either start off from an empty project, or take a peek at a working sample game. Either way, full project structure, cross-platform support, and a testing setup are included! This framework is intended to take steps beyond what you would normally expect from a game framework. This means things like basic UI elements, text rendering, advanced input handling (textboxes) and performance overlays are provided out-of-the-box. Any of the osu! code that is deemed useful to other game projects will live in this framework project. Anywhere we implement graphical components, they will be displayed with a generic design and will be derivable for further customization.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 3
    Entitas Game Engine

    Entitas Game Engine

    Entitas is a super fast Entity Component System (ECS) Framework

    Entitas is a super fast Entity Component System Framework (ECS) specifically made for C# and Unity. Internal caching and blazing-fast component access make it second to none. Several design decisions have been made to work optimally in a garbage-collected environment and to go easy on the garbage collector. Entitas comes with an optional code generator which radically reduces the amount of code you have to write and makes your code read like well-written prose. Entitas is fast, and light and gets rid of unnecessary complexity. There are less than a handful of classes you have to know to a rocket start your game or application. The Code Generator generates classes and methods for you, so you can focus on getting the job done. It radically reduces the amount of code you have to write and improves readability by a huge magnitude. It makes your code less error-prone while ensuring the best performance.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 4
    FlatRedBall

    FlatRedBall

    Cross-platform 2D game engine focused on ultimate productivity

    FlatRedBall is a cross-platform 2D game engine built on the .NET framework, designed to enhance productivity for game developers. It provides a powerful editor and a range of features that have been refined over two decades, making it suitable for developing 2D games across various genres.
    Downloads: 1 This Week
    Last Update:
    See Project
  • Go from Data Warehouse to Data and AI platform with BigQuery Icon
    Go from Data Warehouse to Data and AI platform with BigQuery

    Build, train, and run ML models with simple SQL. Automate data prep, analysis, and predictions with built-in AI assistance from Gemini.

    BigQuery is more than a data warehouse—it's an autonomous data-to-AI platform. Use familiar SQL to train ML models, run time-series forecasts, and generate AI-powered insights with native Gemini integration. Built-in agents handle data engineering and data science workflows automatically. Get $300 in free credit, query 1 TB, and store 10 GB free monthly.
    Try BigQuery Free
  • 5
    OpenTK

    OpenTK

    The Open Toolkit library is a fast, low-level C# wrapper for OpenGL

    The Open Toolkit is set of fast, portable, low-level C# bindings for OpenGL, OpenGL ES, OpenAL, and OpenCL. It runs on all major platforms and powers hundreds of apps, games, and scientific research programs. OpenTK provides several utility libraries, including a math/linear algebra package, a windowing system, and input handling. OpenTK is not a game engine, nor does it try to be one: It offers a useful set of tools and lets you decide how to use them. It is the ideal starting point if you want to write a game or scientific application from the ground up. The OpenGL specification specifies exactly what the result/output of each function should be and how it should perform. It is then up to the developers implementing this specification to come up with a solution of how this function should operate. Since the OpenGL specification does not give us implementation details, the actual developed versions of OpenGL are allowed to have different implementations.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 6
    ZTAB

    ZTAB

    Ze Text Adventure game Builder : Create as you play !

    Software for creating very easily Text adventure games : * Build text adventure games, gamebooks, visual novels or point and clicks * Text, image and sound based aventure games. * Simple graphical game edition (no script) * Design as you play: you play, and if you want to enhance, you add new text and conditions and you continue to play. Nothing simpliest ! * As you design, ZTAB points out your errors and compute playability statistics * Import/export : Windows Game, HTML, RTF, DOCX, POWERPOINT, PDF, EPUB, Advelh, Twine, Quest, Ren'Py * Confidentiality mode Donation : https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=2L5MR7VZZZWRU ZTAB of https://sourceforge.net/projects/ztab/ is provided regarding the terms of the licence Creative Commons Attribution – No commercial use - No modification 3.0 France
    Leader badge
    Downloads: 10 This Week
    Last Update:
    See Project
  • 7
    Panther game engine is being developed as part of a class on game engine development at Chapman University 2009/2010/2011. Development continues through December 2011.
    Downloads: 9 This Week
    Last Update:
    See Project
  • 8

    Captains Game Engine

    Portable game engine with main focus on point-and-click adventures

    This project aims to create a fast game engine that is simple to use. It will support rendering in OpenGL and DirectX and run on Linux, Windows and Android. It even runs in the browser with WebGL through emscripten. It was originally used to create a round-based 3D multiplayer role-playing game called Heroquest. Now, the main focus has shifted to create a portable point-and-click adventure system and some adventure games.
    Downloads: 6 This Week
    Last Update:
    See Project
  • 9
    MMORpgmaker
    A MMORPG Game Engine Writted in Monogame GL full C# Very easy to make a game. With simple Level Editor. Whit cross-plattform Server on .NET Core Tecnology Build your Cross-Platform Game whitout programming! Aviable for Xbox one, PS4, Android, iOS and more platform. Try Live Demo: http://www.makingitalia.net/MireWEB/ Project are migrated on Mire Engine. See Updated at: http://www.makingitalia.net/mire/
    Downloads: 1 This Week
    Last Update:
    See Project
  • AI-powered service management for IT and enterprise teams Icon
    AI-powered service management for IT and enterprise teams

    Enterprise-grade ITSM, for every business

    Give your IT, operations, and business teams the ability to deliver exceptional services—without the complexity. Maximize operational efficiency with refreshingly simple, AI-powered Freshservice.
    Try it Free
  • 10
    Mire Engine

    Mire Engine

    2D Game Engine

    A Cross Platform 2d Rpg Game Engine for mobile and Console.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 11
    Chessmaster Bots Manager

    Chessmaster Bots Manager

    A simple tool to allow Chessmaster 10/11 bot customizations

    This tool allows several bot customizations: - Load all the chess engine settings - Change avatar for any bot - Analyse player's games to get: * Player max elo * Game style (aggressive, positional, etc.) * Preferred opennings - Choose the closest openning book for a player - Save openning book based on player's game stats - Automtically backup bot with with possibility to restore settings Future improvements: - Improve .pgn analysis using external engine or refined position evaluation - Allow to save in either CM10 (best compatibility) or CM11 (more features) - Add tools to create new lessons with audio support
    Downloads: 1 This Week
    Last Update:
    See Project
  • 12
    AquaEngine
    AquaEngine is supposed to be a modern game-engine with BulletPhysics in combination with ODE for vehicle physics. Rendering is using OGRE and OpenGL.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13

    Classic Video-Audio Presentation

    A Tile-based Game Engine written in C# mimicing retro consoles.

    The CVAP game engine is a low-level framework for producing tilemapped games akin to classical consoles such as the Super NES or the Sega Genesis. It is written to provide video, audio, and input support analagous to these systems.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14
    EyesOnly - TopSecret

    EyesOnly - TopSecret

    The world is no longer the same

    The world is no longer the same, to keep the working class together it takes tactical action and quality intelligence for the party to unite more and more and be accepted as unanimity. Join the country's most senior field agents and fight the most entrenched reactionaries. Comrade on-wards the fight continues. License Advice: Creative Commons 1.0 Legal Advice: https://www.dmca.com/r/p20r5p8
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    Fighting Fantasy Fan Engine

    Fighting Fantasy Fan Engine

    Play Fighting Fantasy fan stories on this simple engine

    It is a simple fighting fantasy engine made to play fan made fighting fantasy stories, Fan Stories : From the Shadows (400 sections) , Deathtrap(499 sections-fan sequel to Deathtrap dungeon) , Legacy of the Vampire (167 sections -fan sequel to Vault and Revenge of the Vampire) ,the Rise of the Night Creatures and Ranger of Grewlant.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    This project aims to create a simple open source game engine that can be used to create 2d games. The name itself represents the supporting company GamersGather.com and the S stands for simple. .net 4, C#, XNA Based Technology.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    Generic Collectible Card Game is a multiplayer multiplatform implementation of a card game engine. The card game engine is designed to be of general purpose core for several modules each defining the game specific behaviour.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    KSFramework

    KSFramework

    QQ Group:538722494,KSFramework = KEngine + SLua(or xLua)

    KSFramework is a Unity3D Asset Bundle development framework that integrates KEngine, SLua/XLua/ILRuntime, and provides a set of auxiliary tools for programming, art, planning, and operation. Vika table vika.cn , API-supported data table, perfect real-time collaboration, can be used in 1000+ scenarios such as silky project management, game planning configuration table, data sorting, etc. Hot reloading is the development focus of KSFramework - without restarting the game, reloading the code and configuration table can immediately see the modification effect, maximizing the speed of development and debugging, and facilitating hot updates during the operation phase. For programmers, basic function modules such as AssetBundle loading and packaging, scripted UI, automatic generation of configuration table code, download and update can be used, which greatly reduces the workload of basic functions around the game.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    LightFire# is a fast and small Engine to create platform independent Games and Graphic Applications for Linux, *BSD and Windows Systems. It provides Graphic, Sound, AI and Network support. LightFire# uses OpenGL and is written in C#.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    LumenLiquid

    LumenLiquid

    RPG Games without coding!

    LumenLiquid is a game engine which offers high flexibility. Every user can create his own game without having to worry about code. Trough the high customisation there are almost endless possibilities to create games and stories. To show up the endless possibilities, LumenLiquid is deployed with an example game, Fabled Lands. The story is taken from the homonymous books written by Dave Morris and Jamie Thomson.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21

    MuX Game Engine

    2D XNA Game Engine

    2D Game Engine to create musical games with XNA C#
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    Murder Engine

    Murder Engine

    Murder is a pixel art ECS game engine

    Murder is an open-source, pixel-art–focused, entity-component-system (ECS) game engine built on top of FNA (a reimplementation of MonoGame). The engine aims to give developers a solid, flexible foundation for building 2D games with a retro/pixel-art aesthetic, while leaning into modern ECS architecture to separate data (components) from behavior (systems). Because Murder is in active development and still relatively young, the authors warn that breaking changes are possible — but this also means the engine is evolving rapidly as features are added and refined. Using Murder, you get a lot of the low-level plumbing handled: rendering, input, update-loop, resource loading — so you can focus on actual game logic, art, and design instead of boilerplate. It powers projects like games built by its creators and even won a game-jam with one of those, demonstrating that despite its youth, it's already production-capable. For developers comfortable working in C# and aiming for indie 2D games.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    The OpenRTSS project aims at producing a free game engine for making "Real-Time Strategy Shooters". The engine is written using Unity for simplicity and fast development.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    Ox is a 3D XNA game engine. Note that this web page is only for hosting Ox's source. Find Ox's main website here - http://oxgameengine.codeplex.com/
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    SadConsole

    SadConsole

    A .NET ascii/ansi console engine written in C# for MonoGame and XNA

    SadConsole is a generic library that emulates old-school console game systems. It provides command prompt-style graphics where one or more tile textures are used to represent an ASCII character set. Console's are made up of a grid of cells, each of which can have its own foreground, background, glyph, and special effect applied to it. While SadConsole is a generic library that doesn't provide any rendering capabilities, "host" libraries are provided that add renderers to SadConsole. The two hosts provided by this library are for MonoGame and SFML. SadConsole currently targets .NET 6, .NET 5, .NET Core 3.1, and .NET Standard 2.1. Uses graphical tile-based images to build out an ASCII-character font with support for more than 256 characters. Use more than one font file. However, each console is restricted to a single font.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Previous
  • You're on page 1
  • 2
  • Next
MongoDB Logo MongoDB