Open Source C# Games
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Browse free open source C# Games and projects below. Use the toggles on the left to filter open source C# Games by OS, license, language, programming language, and project status.
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Roblox Account Manager
Application that allows you to add multiple accounts into one apps
Roblox Account Manager is a desktop application designed to simplify the management of multiple Roblox accounts within a single interface. The software allows users to store and organize multiple account credentials and quickly launch different accounts without manually logging out and back in through the Roblox client. This capability is particularly useful for players who manage alternate accounts for storage, trading, or gameplay purposes. The application provides a centralized dashboard where users can switch between accounts, launch games, and manage authentication tokens. It also includes utilities for joining servers, retrieving authentication tickets, and launching multiple game sessions with different accounts. The program is written in C# and was designed as a convenience tool for players who frequently switch between accounts. -
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XOutput
DirectInput to XInput wrapper
If you have an older or not supported game controller (gamepad, wheel, joystick, etc.), but XBox 360 controllers are supported you can use this software and enjoy gaming with your controller. XOutput is a software that can convert DirectInput into XInput. DirectInput data is read and sent to a virtual XInput (Xbox 360 Controller) device. XInput is the new standard game controller input on windows, and DirectInput can no longer be used with Universal Windows Platform software, but with this tool you can use DirectInput devices as well. -
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tModLoader
A mod to make and play Terraria mods. Supports Terraria 1.4
tModLoader (TML) is an open-source, community-driven, modification and expansion of the Terraria game that makes it possible to make and play mods. TML expands your Terraria adventures with new content to explore created by the Terraria community! TML allows players to create and play Terraria mods and is designed in such a way so that you can play alone or together with friends, with one mod or with multiple mods, choose to play however you like! It is however required that all your friends also install TML if you want to play together; vanilla users can't play with TML users. First and foremost, TML is largely a community endeavor, built by the community; used by the community. Without all the contributions people in the community have made over the years, TML would not be in the state it is in. TML is a free-to-use modification of the game and will stay that way. -
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ii's Stupid Menu
A mod menu for Gorilla Tag with over 1000+ mods
ii’s Stupid Menu is an open-source mod menu for the VR game Gorilla Tag that provides a wide range of gameplay modifications and utilities through an in-game interface. It is designed to give players and developers access to a large collection of mods that can alter movement, interaction, and game mechanics. The menu includes hundreds of features, ranging from cosmetic changes to more advanced gameplay modifications, making it one of the more extensive modding tools available for the game. It is built with a modular architecture that allows developers to extend or customize functionality, encouraging community contributions and experimentation. The project emphasizes openness and collaboration, aiming to keep modding accessible rather than locked behind proprietary systems. It supports multiple VR platforms and includes compatibility layers for different hardware setups. -
Gemini 3 and 200+ AI Models on One PlatformBuild generative AI apps with Vertex AI. Switch between models without switching platforms.
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Steamless
DRM remover of the SteamStub variants
Steamless is a DRM remover of the SteamStub variants. The goal of Steamless is to make a single solution for unpacking all Steam DRM-packed files. Steamless aims to support as many games as possible. Steamless aims to be a single solution for unpacking all variants of the SteamStub DRM, ranging from the very first version to the most recently released. Steamless will remove the SteamStub DRM protection layer that is applied via the DRM tool from the Steamworks SDK. Steamless will never remove the Steamworks API integration. (via steam_api.dll/steam_api64.dll) Steamless will never include or distribute any emulator for the Steamworks API integration. Steamless will never handle Valve's CEG (Custom Executable Generation) DRM that is used on some older games. Steamless will never promote, encourage, or assist with piracy. Steamless will never assist with bypassing anti-cheats or other protections in place by games. -
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Virtual Controller
Program to control vJoy / vXbox Device via keyboard, mouse, joystick.
Description Program to control Virtual Input Devices via physic Input Devices. Supported Virtual Input Devices: vJoy (Virtual Generic Joystick) vXbox (Virtual Xbox 360 Gamepad) vKeyboard (Simulated Keyboard) vMouse (Simulated Mouse) Supported Physic Input Devices: Keyboard Mouse Joystick System Requirements Operating system: Windows XP, Windows 7, Windows 8, Windows 10 Additional software: NET Framework 4 Notes: For Windows 7, for the virtual Xbox 360 Gamepad to work correctly, you need to install the following components: Microsoft Xbox 360 Accessories, Microsoft Security Advisory 3033929 -
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Steam Achievement Manager
A manager for game achievements in Steam
Steam Achievement Manager is a lightweight, portable desktop application designed to give users direct control over achievements and statistics associated with their Steam games. It works by interfacing with the Steam client and APIs, allowing users to unlock, relock, or modify achievements without needing to launch the actual game. The tool provides a simple interface where users can browse their game library, select a title, and view all available achievements in a structured format. Because it operates independently of the game itself, it is often used to recover bugged achievements, reset progress, or manage completion status across different titles. The application requires Steam to be running and the user to be logged in, ensuring that changes are applied directly to the account’s achievement data. Its portability means it can be run without installation, making it convenient for quick use across systems. -
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Irrlicht Engine
3D Engine c++
The Irrlicht Engine is an open source high performance realtime 3D engine written and usable in C++. It is completely cross-platform, using D3D, OpenGL and its own software renderers. -
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PKHeX
Pokémon Save File Editor
Pokémon core series save editor, programmed in C#. Data is displayed in a view that can be edited and saved. The interface can be translated with resource/external text files so that different languages can be supported. Pokémon Showdown sets and QR codes can be imported/exported to assist in sharing. PKHeX expects to save files that are not encrypted with console-specific keys. Use a save data manager to import and export save data from the console (Checkpoint, save_manager, JKSM, or SaveDataFiler). We do not support or condone cheating at the expense of others. Do not use significantly hacked Pokémon in battle or in trades with those who are unaware hacked Pokémon are in use. PKHeX is a Windows Forms application that requires .NET Framework v4.6, with experimental support for .NET 6.0. The executable can be built with any compiler that supports C# 10. -
AI-generated apps that pass security reviewRetool lets you generate dashboards, admin panels, and workflows directly on your data. Type something like “Build me a revenue dashboard on my Stripe data” and get a working app with security, permissions, and compliance built in from day one. Whether on our cloud or self-hosted, create the internal software your team needs without compromising enterprise standards or control.
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NVIDIA Profile Inspector
Modify game profiles inside the internal driver database
NVIDIA Profile Inspector is a specialized utility that allows users to view and modify hidden graphics driver settings within NVIDIA’s internal profile database, providing deeper control than the official NVIDIA Control Panel. It exposes advanced and undocumented configuration options that can influence rendering behavior, performance optimization, and compatibility for specific games. Users can create, edit, and assign profiles for individual applications, enabling fine-grained tuning of GPU behavior beyond standard settings. The tool is particularly popular among enthusiasts who want to optimize performance, troubleshoot graphical issues, or enable experimental features such as custom DLSS configurations. It provides a detailed interface for browsing and editing driver parameters, making it possible to adjust settings that are otherwise inaccessible. -
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DualSenseX
Connect your DualSense Controller, use Adaptive Triggers
DualSenseX is an open-source utility that brings advanced control and customization to Sony DualSense and DualShock controllers on Windows, offering functionality that goes far beyond the native drivers. The application allows gamers to tailor every aspect of their controller experience, including adaptive trigger behavior, haptic intensity, and light bar customization, which empowers users to fine-tune feedback to match the feel of their favorite games. It also provides real-time battery monitoring, gyro/accelerometer calibration, and remappable button layouts, giving players hardware flexibility usually reserved for premium third-party software. DualSenseX works with both Bluetooth and USB connections, automatically detecting compatible controllers and maintaining stable input even during intense gaming sessions. Additionally, it includes profiles and presets so users can save and switch configurations quickly for different games or genres. -
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BetterJoy
Allows the Nintendo Switch Pro Controller, Joycons and SNES controller
BetterJoy is a Windows application that enables Nintendo Switch controllers, including Joy-Con and Pro Controllers, to function seamlessly on PC by emulating standard input devices such as XInput. It acts as a compatibility layer that allows these controllers to be used with a wide range of games, emulators, and software that would otherwise not recognize them natively. The software supports integration with popular emulators like Cemu, Dolphin, and Yuzu, as well as general system-wide input for PC gaming. One of its standout features is gyro support, which can be mapped to mouse movement or used in compatible games for motion control. It also allows users to remap buttons, including special inputs like capture and SL/SR buttons, providing a high degree of customization. BetterJoy works over both USB and Bluetooth connections, making it flexible for different setups. -
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S&box
s&box is a modern game engine, built on Valve's Source 2
S&box is the open-source codebase for s&box, a next-generation sandbox game development platform from the creators of Garry’s Mod that blends modding freedom with modern tooling and performance. Built on a cutting-edge game engine, s&box allows creators to prototype, build, and share interactive game modes, tools, and environments using C#, JavaScript, and visual scripting, promoting accessible content creation for developers of varying skill levels. The platform emphasizes multiplayer and community experiences, giving creators direct control over networking, physics, rendering, and audio without needing to build those systems from scratch. With real-time recompilation and fast iteration loops, developers can see changes instantly, speeding up the creative process dramatically compared to traditional engines. The sbox ecosystem fosters collaboration, sharing, and extension through packages and community content, enabling a vibrant marketplace of user-created mods and assets. -
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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. -
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Script Hook V .NET (SHVDN)
An ASI plugin for Grand Theft Auto V
ScriptHookVDotNet is an open-source scripting framework for Grand Theft Auto V that enables developers to create and run custom scripts using languages such as C# and VB within the game environment. It acts as a bridge between the game engine and managed code, allowing modders to interact with game systems through a structured and object-oriented API. Built on top of the original Script Hook V, it simplifies the scripting process by providing higher-level abstractions and reducing the need to work directly with low-level native functions. The framework supports real-time script execution and reloading, enabling developers to test and iterate on their modifications without restarting the game. It also includes an in-game console and debugging capabilities, making development more efficient and interactive. ScriptHookVDotNet is widely used in the GTA V modding community to create custom gameplay mechanics, tools, and enhancements. -
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VGMToolbox is a C# based tool to assist VGM collectors and dumpers. It includes tools to extract, optimize, and build VGM formats as well as auditing and exploration utilities. [GBS, KSS, MDX, NSF(E), SID, S98, SPC, VGM, XA, XMA, xSF (PSF/PSF2/etc)]
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Monke Mod Manager
Mod Installer for the PC version of Gorilla Tag
MonkeModManager is a mod management tool created for games within the Gorilla Tag ecosystem, providing users with an easy way to install, update, and manage mods without manual file handling. The application simplifies the modding process by offering a graphical interface where users can browse available mods and apply them with minimal effort. It automatically handles file placement, dependency management, and compatibility checks, reducing the risk of user error. The manager also supports updating mods, ensuring that users always have access to the latest versions without needing to track changes manually. Designed with accessibility in mind, it allows even non-technical users to customize their gameplay experience. It also includes safety mechanisms to help prevent issues such as corrupted installations or incompatible mod combinations. -
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Playnite
Video game library manager with support for wide range of libraries
Link games from Steam, Epic, Origin, GOG, Battle.net, Ubisoft Connect and other services, including games that are not installed! Playnite supports a wide variety of console emulators. Playnite's look can be fully customized, from simple color changes to complete layout re-designs. Playnite's functionality can be extended with plugins and script extensions. Fullscreen mode with full controller support is available. Playnite tracks your time in-game (any game including emulated ones). Playnite's user interface is fast and light on resources, even with large libraries. Playnite can run from portable storage without the need of installing system dependencies. No Playnite features are locked behind a paywall and the complete source code is available under the MIT license. Playnite doesn't store any user information on remote servers. All information about your library is stored locally on your PC. -
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Watt Toolkit
Open source cross-platform multi-purpose game toolkit
"Watt Toolkit" is an open-source cross-platform multi-purpose game toolkit, most of its features require you to download and install Steam to use it. Make the Steam community, Github, Google reCAPTCHA, Pixiv, Discord, Twitch and other domestic hard-to-access pages accessible properly. Some JS scripts are injected into web pages through an acceleration service that intercepts web requests, providing functionality similar to that of a web plugin. Functions similar to Steam community 302, using Titanium-Web-Proxy open source project for local anti-generation. Switch between Steam accounts that are already logged in on the current PC with one click, and manage features such as sorting your home shared library. Lets you manage your Steam game inventory directly, not only by downloading older Steam games but also by managing Steam game achievements directly, supporting unlocked achievements and unlocked achievements. -
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Minecraft Console Client (MCC)
Lightweight console for Minecraft chat and automated scripts
Minecraft Console Client (MCC) is a lightweight cross-platform open-source Minecraft TUI client for Java edition that allows you to connect to any Minecraft Java server, send commands, and receive text messages in a fast and easy way without having to open the main Minecraft game. -
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ArchiSteamFarm
C# application with primary purpose of farming Steam cards
ASF is a C# application with the primary purpose of farming Steam cards from multiple accounts simultaneously. Unlike Idle Master which works only for one account at a given time, while requiring Steam client running in the background and launching additional processes imitating "game-playing" status, ASF doesn't require any Steam client running in the background, doesn't launch any additional processes and is made to handle unlimited Steam accounts at once. In addition to that, it's meant to be run on servers or other desktop-less machines and features full cross-OS support, which makes it possible to launch on any operating system with .NET Core runtime, such as Windows, Linux, and macOS. ASF is possible thanks to the gigantic amount of work done in the marvelous SteamKit2 library. Today, ASF is one of the most versatile Steam power tools, allowing you to make use of many features that were implemented over time. -
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NitroType Cheat v2
An easy-to-use, working NitroType hack for typing at insane speeds!
NitroType Cheat v2 is a browser-based or script-driven tool designed to automate typing performance in the Nitro Type online racing game by simulating extremely high typing speeds and accuracy. It works by intercepting or generating input events that mimic rapid and precise keystrokes, allowing users to achieve unrealistically high words-per-minute scores. The project is built for ease of use, often requiring minimal setup or configuration to begin automating gameplay. It demonstrates how client-side input manipulation can influence outcomes in browser-based games that rely on user input validation. While it provides a clear advantage in gameplay, it also highlights potential vulnerabilities in systems that do not enforce strict server-side validation of user actions. The tool is primarily intended for experimentation or demonstration rather than legitimate competitive use. -
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MonoGame
One framework for creating powerful cross-platform games
One framework for creating powerful cross-platform games. The spiritual successor to XNA with thousands 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. By leveraging C# and other .NET languages on Microsoft and Mono platforms you can write modern, fast, and reliable game code. We currently support iOS, Android, MacOS, Linux, all Windows platforms, PS4, PSVita, Xbox One, and Switch with more platforms on the way. All the code is available to you ensuring you'll have the ability to make changes when you need to or even port to whole new platforms. With 1000s of shipped games we have built up a vibrant community of developers which use MonoGame for both fun and profit. -
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ModAssistant
Simple Beat Saber Mod Installer
ModAssistant is a simple PC mod installer for Beat Saber, using mods from BeatMods. Beat Saber is the popular VR rhythm game where players must slash the beats as they fly towards them to the beat of lively music. ModAssistant comes with a number of great features like dependency resolution, mod uninstallation, and a complex theming engine. It features light, dark, BSMG and light pink themes, and can even have your own custom theme! Have more fun playing Beat Saber by customizing your experience with ModAssistant! -
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SaveParser
Total War Savegame Editor / Parser
Savegame editor for Total War games savegames. Supports Total War "Warhammer 2", "Warhammer", "Attila", "Rome 2", "Shogun 2", "Napoleon" and "Empire" savegame files, Includes also some tools which could be needed for developer for savegame-based application.
