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

  • MongoDB Atlas runs apps anywhere Icon
    MongoDB Atlas runs apps anywhere

    Deploy in 115+ regions with the modern database for every enterprise.

    MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
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  • Contractor Foreman is the most affordable all-in-one construction management software for contractors and is trusted by contractors in more than 75 countries. Icon
    Contractor Foreman is the most affordable all-in-one construction management software for contractors and is trusted by contractors in more than 75 countries.

    For Residential, Commercial and Public Works Contractors

    Starting at $49/m for the WHOLE company, Contractor Foreman is the most affordable all-in-one construction management system for contractors. Our customers in 75+ countries and industry awards back it up. And it's all backed by a 100 day guarantee.
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  • 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: 13 This Week
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  • 2
    Impostor

    Impostor

    An open source reimplementation of the Among Us Server

    Impostor is an open source reimplementation of the Among Us Server, written in C#. It is among the first Among Us private servers with support for Steam, Itch, Android and iOS. It is a full replacement of the game's official server, so you can expect all of the game's features to be included, and the same fun playing experience. The difference of course is that you get to play on a private and secure server. Impostor has plugin support as well as a server-sided anticheat feature. You also have the option of playing on a server hosted by someone else.
    Downloads: 12 This Week
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  • 3
    Pinta

    Pinta

    Simple GTK# Paint Program

    Pinta is a free, open-source program for drawing and image editing. Its goal is to provide users with a simple yet powerful way to draw and manipulate images on Linux, Mac, Windows, and BSD. Use easy drawing tools to draw freehand, lines, rectangles, ellipses, and more. Pinta includes over 35 adjustments and effects for tweaking your images. Use Pinta in your language. Pinta is at least partially translated into over 55 languages. Don't be afraid to experiment, Pinta tracks your full history so you can always undo. Use layers to help separate and group elements of your image for easy editing. Like docked windows? No problem. Floating windows? No problem. You can even mix and match. Original Pinta code is licensed under the MIT License, see license-mit.txt for the MIT License. Code from Paint.Net 3.36 is used under the MIT License and retains the original headers on source files.
    Downloads: 12 This Week
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  • 4
    A collection of tools related to creating and using mods in Fallout 3. From kaburke: Sorry for the lack of recent support. I haven't abandoned everyone, but I am actively working to create the best FOMM yet.
    Downloads: 62 This Week
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  • CloudZero: The Cloud Cost Optimization Platform Icon
    CloudZero: The Cloud Cost Optimization Platform

    CloudZero automates the collection, allocation, and analysis of your infrastructure and AI spend to uncover waste and improve unit economics.

    CloudZero is the leader in proactive cloud cost efficiency. We enable engineers to build cost-efficient software without slowing down innovation. CloudZero's next-generation cloud cost optimization platform automates the collection, allocation, and analysis of cloud costs to uncover savings opportunities and improve unit economics. We are the only platform that enables companies to understand 100% of their operational cloud spend and take an engineering-led approach to optimizing that spend. CloudZero is used by industry leaders worldwide, such as Coinbase, Klaviyo, Miro, Nubank, and Rapid7.
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  • 5
    MisakaTranslator

    MisakaTranslator

    Galgame's Multilingual Real-time Machine Translation Tool

    MisakaProject is a collection of all projects developed based on MisakaTranslator or its auxiliary functions. If you are interested in adding your own projects of related types to MisakaProject, please contact the author. MisakaPatcher added support for plug-in Chinese patch, so this tool is more suitable for players who like manual translation, and also provides another way for Chinese personnel who have difficulty unpacking packets to release Chinese patch. MisakaHookFinder is suitable for some games where the translator can not be used to directly get the text hook method. Users can search for the hook special code by themselves or directly use it to get the source text. At the same time, it also supports the clipboard to output the original text.
    Downloads: 11 This Week
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  • 6
    Minecraft Texture Studio

    Minecraft Texture Studio

    Easily create resource packs for Minecraft

    Easily create resource packs for minecraft. Program automatically detects your minecraft installation and imports the textures from minecraft allowing you to edit them easily, and import them into minecraft. You can also save your resource pack and give them them to friends, backup them up or post them online. Includes a 3D preview of all the blocks in minecraft and any changes you make to the textures is shown straight away on the preview
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    Downloads: 277 This Week
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  • 7
    ClassicUO

    ClassicUO

    An open source implementation of the Ultima Online Classic Client

    ClassicUO is an open-source, modern client for Ultima Online, a beloved MMORPG originally released in the late 1990s. Designed as a drop-in replacement for outdated clients, ClassicUO supports high performance, modding, and quality-of-life improvements while preserving the game's core look and mechanics. It’s built using .NET Core and runs cross-platform, offering smoother input, faster rendering, and extensibility for private servers. The project is community-driven and continues to evolve in parallel with the fan-maintained ClassicUO ecosystem.
    Downloads: 10 This Week
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  • 8
    Pokemon Unity

    Pokemon Unity

    A framework to build Pokémon RPG games

    A framework to build Pokémon RPG games. I use IIcolour Spectrum's original Pokemon Unity as a base with Herbertmilhomme's framework. So far, this project use wrapper ( Legacy <=> Framework ), and in the future, I want to remove the wrapper. This project is playable, but it has some issues and some features are disabled. Use Unity Hub or Editor to import this project's folder (/Pokemon Unity). Build and run the project. There are also demos for Windows, Linux, and Mac zipped in Releases!
    Downloads: 9 This Week
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  • 9
    Wurst Hacked Client

    Wurst Hacked Client

    Wurst Minecraft Hacked Client 1.21.10

    Wurst New Best Minecraft Java Edition Hack Client Free Download Wurst is a client for Minecraft Java Edition, this mod allows you to be able to fly in survival mode, gain speed, X-ray, auto bridge, kill aura and many more features! ⚠️ Use at Your Own Risk This repository is provided as-is. Using it may lead to a ban or other consequences depending on how and where it's used. You have been warned. This project is licensed under the MIT License
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    Downloads: 128 This Week
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  • Peer to Peer Recognition Brings Teams Together Icon
    Peer to Peer Recognition Brings Teams Together

    The modern employee engagement platform for the modern workforce

    Create a positive and energetic workplace environment with Motivosity, an innovative employee recognition and engagement platform. With Motivosity, employees can give each other small monetary bonuses for doing great things, promoting trust, collaboration, and appreciation in the workplace. The software solution comes with features such as an open-currency open-reward system, insights and analytics, dynamic organization chart, award programs, milestones, and more.
    Learn More
  • 10
    Fishstrap

    Fishstrap

    Fishstrap is a Bloxstrap Fork.

    Fishstrap is an open-source, feature-packed fork of Bloxstrap, designed to enhance your Roblox launcher experience. It offers a faster, more reliable, and customizable way to launch Roblox, built with Windows PC users in mind. Fishstrap supports all Roblox versions and includes advanced features like multi-instance launching, customizable menus, FastFlags tuning, and in-depth logging. Unlike other launchers, Fishstrap provides unmatched performance, stability, and customization options. Whether you’re a developer, casual player, or content creator, Fishstrap enhances your gameplay with seamless multi-account support, detailed player activity tracking, and more. With regular updates and an active community, Fishstrap is always evolving to stay ahead of the curve. It's completely open-source for full transparency and user-driven development. Official website: https://fishstrap.org/
    Downloads: 223 This Week
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  • 11
    Basic Computer Games

    Basic Computer Games

    An updated version of the classic "Basic Computer Games" book

    Basic Computer Games is a modern revitalization of the classic “Basic Computer Games” book’s collection of games, ported and expanded into various modern, memory-safe and scripting languages. It includes illustrative code examples of many classic games (e.g. Blackjack, Bowling) in multiple languages, with the goal of making the historical games accessible and educational in safe modern environments. Definitely use the most recent versions and features of the target language, but also try to keep the code samples simple and explainable – the goal is to teach programming in the target language, not necessarily demonstrate the cleverest one-line tricks, or big system "enterprise" coding techniques designed for thousands of lines of code.
    Downloads: 7 This Week
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  • 12
    RocksmithToTab

    RocksmithToTab

    Exports Rocksmith 2014 songs to Guitar Pro tabs

    Exports Rocksmith 2014 arrangements to Guitar Pro tabs (.gp5, .gpx). It parses Rocksmith's .psarc archives and converts any songs found within to tablature. All the Rocksmith techniques are supported and translated, and you get all of the chord diagrams and fingering hints that Rocksmith shows you. It's a great way to figure out specific parts of a song, and Guitar Pro's speed trainer is a very good alternative to the riff repeater. All arrangement types (bass, lead, rhythm) can be exported, either together in a single tab or into separate tabs.
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    Downloads: 43 This Week
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  • 13
    XBox One Controller Battery Indicator

    XBox One Controller Battery Indicator

    Tray application that shows a battery indicator for an Xbox controller

    A tray application that shows a battery indicator for an Xbox-ish controller and gives a notification when the battery level drops to (almost) empty. It was originally written for the XBox One controller since Microsoft dropped all visual hints for low battery, but it should work with any gamepad that can be addressed via XInput (which should be all controllers that work in XBox-controller-enabled games). Download the link for a "ready to run" version at the bottom of this page(or under "Releases" in the side bar)! When more than one controller is present, the tray icon will cycle through the status display every 5 seconds.
    Downloads: 6 This Week
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  • 14
    XCharts

    XCharts

    A charting and data visualization library for Unity

    A charting and data visualization library for Unity. Unity data visualization chart plugin. A UGUIpowerful, easy-to-use, parameter-configurable data visualization chart plug-in. It supports ten built-in charts. A powerful, easy-to-use, configurable charting and data visualization library for Unity. Visual configuration of parameters, real-time preview of effects, and pure code drawing without additional resources. Support ten built-in charts such as line chart, column chart, pie chart, radar chart, scatter chart, heat map, ring chart, candlestick chart, polar coordinate, parallel coordinate and so on. Supports 3D column charts, funnel charts, pyramids, dashboards, water level charts, pictographic column charts, Gantt charts, rectangular tree charts and other extended charts. Line graphs such as line graphs, curve graphs, area graphs, and stepped line graphs are supported.
    Downloads: 6 This Week
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  • 15
    Doom Builder
    Comprehensive map editor for Doom, Heretic and Hexen based games and sourceports. Includes 3D editing mode and various other modern tools and techniques such as script editors with syntax highlighting and auto-complete.
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    Downloads: 39 This Week
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  • 16
    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: 5 This Week
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  • 17
    The Open Toolkit is an advanced, cross-platform, C# OpenGL, OpenAL and OpenCL wrapper for Mono/.Net. It is especially suitable to RAD development and can be used in games, GUIs (WinForms, WPF, GTK#) and scientific applications. The official repository can be found in github: https://github.com/opentk/opentk The sourceforge repository will no longer be updated, but will remain online for posterity.
    Downloads: 30 This Week
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  • 18
    C# SDL
    SDL.NET is a set of object-oriented .NET bindings for the SDL gaming library and provides high-level access to audio, keyboard, mouse, joystick, TTF fonts, various image formats, sound mixing, MPEG-1, and 2D video framebuffer.
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    Downloads: 43 This Week
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  • 19
    UniTask

    UniTask

    Provides efficient allocation free async/await integration for Unity

    Provides an efficient allocation free async/await integration for Unity. Struct-based UniTask<T> and custom AsyncMethodBuilder to achieve zero allocation. Makes all Unity AsyncOperations and Coroutines awaitable. PlayerLoop-based task(UniTask.Yield, UniTask.Delay, UniTask.DelayFrame, etc..) that enables replacing all coroutine operations. MonoBehaviour Message Events and uGUI Events as awaitable/async-enumerable. Runs completely on Unity's PlayerLoop so doesn't use threads and runs on WebGL, wasm, etc. Asynchronous LINQ, with Channel and AsyncReactiveProperty. TaskTracker window to prevent memory leaks. Highly compatible behavior with Task/ValueTask/IValueTaskSource. In UniTask v2, almost everything is zero-allocated due to a thorough rewrite of the code (Technical details to follow). In addition to significant performance improvements, the new asynchronous sequences, and Asynchronous LINQ.
    Downloads: 4 This Week
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  • 20
    Oblivion Works
    Wrye Bash has moved to Github! Downloads: https://github.com/wrye-bash/wrye-bash/releases Code: https://github.com/wrye-bash/wrye-bash
    Downloads: 17 This Week
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  • 21
    Trancity is simulator of public transport, where you can operate the tram, trolley or bus, as well as create a city where traffic will be established to work on your routes and schedules.
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    Downloads: 49 This Week
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  • 22
    Netcode for GameObjects

    Netcode for GameObjects

    Netcode that provides networking capabilities to GameObject workflows

    Netcode for GameObjects is a Unity package that provides networking capabilities to GameObject & MonoBehaviour workflows. The framework is interoperable with many low-level transports, including the official Unity Transport Package. Visit the Multiplayer Docs Site for package & API documentation, as well as information about several samples which leverage the Netcode for GameObjects package. You can also jump right into our Hello World guide for a taste of how to use the framework for basic networked tasks. We’re evolving our solution, built on Netcode for GameObjects, in the open to become a netcode foundation that you can depend on – customizable and extensible to meet the needs of many multiplayer games types.
    Downloads: 3 This Week
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  • 23

    CoCEd

    A save editor for the game "Corruption of Champions".

    CoCEd has moved to GitHub ( https://github.com/tmedwards/CoCEd ).
    Downloads: 43 This Week
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  • 24
    Roblox Auto Clicker & Macro

    Roblox Auto Clicker & Macro

    Roblox but have auto clicker. Don't waste your time for click.

    Free auto clicker for Roblox. You don't need to click manually, let us do it for you. This program made by UfukGames and supporting 3 languages (Türkçe,Deutsch, English). You can use this program as an macro also. This program scanned before published.
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    Downloads: 44 This Week
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  • 25
    Manic Digger is a public domain 3d block-building game similar to Minecraft.
    Downloads: 14 This Week
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