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SAGE stands for Simple Asynchronous Game Engine and is an attempt to implement a multithreaded game engine in C#. For rendering/physics/sound/etc it uses(/will use) open source libraries (like OGRE, ODE, etc) through plugins.
The vTracker is an open-source stat tracker/media player framework that can be used to track games that use a variant of the Q3 Engine. It has the option to store the users statistics online, and is written in Visual C#.
An online 3D hand to hand combat game utilizing the Open Dynamics physics engine for full realism. Coupled with a custom move designer and an online ladder and ranking system, RagDoll Combat is the ultimate in head to head online fighting and competition
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BooGame is an object oriented CLS-compliant, 2D game engine framework that provides high-level hardware accelerated video, audio, keyboard, mouse, embedded scripting and many image formats. Written in C#, BooGame targets .NET 1.1, 2.0 and Mono platforms.
A 2D game engine developed with C# using MS .NET and DirectX 9.0b. Will include some games using this engine. Currently planned: A space taxi kind of game.
The General Creature Simulator will be a creature/human simulator somwhat akin to The Sims, and will wake use of the Irrlicht graphics engine and the Lua scripting language.
Swift Engine provides classes and interfaces to help in the fast and easy development of 2D games under the .NET framework. It uses Managed Direct3D and it's written in C#. It provides support to advanced functions like Pixel Shader or render to Texture.
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A cross-platform terrain rendering engine that uses advanced techniques such as dynamic tessellation to render complex landscapes at high frame rates. Suitable for use in games, engineering, simulation, etc.
The xGSuite (Created by: X - Game Suite) is a general collection of vb.net projects ranging from DirectX Graphics, HLSL, Phisics, Game Console, Scene Management, Collision Detection, UI, and Game Engine Core. As well the addition of more in the future.
Black Crystal is a open-source MMORPG creation system created with Microsoft's Visual C# 2005(.NET 2.0). The engine will support Lua scripting, advanced networking, DirectX9, and lots more.
GameGuts is a collection of low-level services for game development. It is not a game engine; it is a foundation on which to build an engine. A DLL with a C API, targeted at higher-level languages. Includes bindings for .NET, more to come.
TigerMUD's goal is to let anyone create virtual game worlds with our feature-rich MUD engine with easy setup, combat, player housing, city governments, crafting, and more. It is written in C# and supports Access, MySQL, and MS SQL databases.
Sirophix MUD is a revolutionary MUD engine. Where other MUDs promise an extensible or OO architecture, Sirophix will actually deliver. Sirophix MUD is designed from the ground up to support extensibility and dynamic systems based on compiled .NET code.
Who doesn't know chess? Who doesn't know c#? why not mixing the together?
ExCs is a chess game whose engine and the GUI are written totally in C# without any kind of external library inclusion.
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor
The first 3D game engine built in C# for .NET, predecessor to the Visual3D Game Engine (https://www.poweraccess.net/visual3d-game-engine), an All-in-One Game Development Tool for Next-Gen 3D Games, MMOs, Simulations and Virtual Worlds powered by Microsoft XNA.
DEPOT is a project manager for jDoom addons (to be expanded for other ports). While designing an add-on, users often accumulate many different files, making it hard to manage them. DEPOT is a solution for this, providing easy ways to work with content.
Open source kit/library collection for use in developing RPGs. Libraries for characters, items, maps, etc. As well as a development engine that ties it all together.
A 3D graphics engine for use in 3D games and other real-time rendering applications using managed code (C#) and the .NET framework and supporting both the OpenGL and Direct3D APIs
Fraction is a flexible .NET framework for creating applications powered with cutting-edge technology, such as shader support, render targets, environment mapping and more.
TriviaBot is a C# trivia engine designed to run in Shadows Direct Connect Hub. Comes with a question file with 20000+ questions which is easy to add/modify.