AdvEng Engine is a game engine built for Isometric games like RPGs and adventure games.

Akisi is a simple blogging platform based on .Net Framework 4.5.1 and using the MVC design pattern. Configuring and using it should be simple, quick, and easy.

The ALGE OpenGL ES SDK enables you to develop applications for several platforms in a unified development environment.

The goal is to make a library of animation components that allows programmers to easily animate their models.

Aran is an XNA-compliant .NET automated planning framework developed as its author Bachelor Thesis at Carlos III University of Madrid, under the supervision of the Planning and Learning Group.

Attollo 3D XNA Engine is a managed engine written in XNA 1.0 and C# 2.0. This engine is written using managers and wrappers for easy content generation through a scenegraph. Features particle effects, model loading, terrain, etc.

The Axiom 3D Engine is an open-source, cross-platform 3D graphics rendering engine for .NET and Mono.

3D graphics engine, targetting Silverlight, Windows Phone 7, Xna and OpenGL.

Moteur de rendu 2D avec XNA 3.1 pour Microsoft Surface et Windows.

BlogEngine.NET is a full featured blog engine targeted at .NET developers. It is light weight and very simple to modify and extend.

Buttermilk is a *DISCONTINUED* 2D XNA game / GUI engine that was being built for the game "Rogue Bishop". It's a very easy-to-use 2D game engine which tranparently supports 3D objects in the 2D scene graph. It currently includes a dynamically-skinned GUI system. The GUI system is completely separated from the 2D game engine in its own project module, and can be used in any XNA application, 2D or 3D.

cbxGameCode (Formerly called Zider Engine) is a generic collection of 100+ game related projects and utilities for XNA, Unity, & Silverlight.

The Object-oriented database and knowledge base management system Cerebrum uses network data model. Cerebrum makes it easier for developers to save the state of the complex objects graph or the neural network into the database.

C# based Chess Platform with simple computer player (engine) and GUI.

An XNA game engine implemented in C# and IronPython.

CreamX is a 2D library for XNA to help the developer get their game written faster. CreamX is in 2 parts. Part 1 is the CreamXEngine library. This is the core of the engine, this is where sprites are loaded and manipulated Part 2 is the CreamX Studio. This allows you to visually design you game and manipulate objects properties from an easy to use interface

Cube Defense is a wave based zombie survival game with much much more

Daphne Checkers 2015 is an application for playing Czech Draughts.

... a flexible 3D utility knife, which enables artists and technical professionals to rapidly build their vision. The DarkWynter engine is designed for students, researchers, and industry personnel interested in rapidly prototyping 3D applications. It has been constructed in response to the vizualization community's need for a modular system which can support a variety of research and educational gaming requirements. We focus on extending simple override systems to the user, making it easy to prototype new technologies quickly. The student or researcher is provided a flexible architecture with default behaviors built-in. The specific area of research can be overridden with minimal support development. Through our efforts we hope to provide the flexibility and horsepower necessary to generate modern 3D applications within the 3-5 months students have available in the semester. Far from being a simple XNA engine, we integrate approximately 30k C# lines of code with around 3k GPU graphics and computational code. Project development interfaces allow for extension (or replacement) of major engine components using a simple override pipeline. Other features include: - Layered MVC-extended architecture with data-centric pipeline execution - 3D Object Data Model - Engine override hooks - Draw and GPGPU shader architecture - Build and Deploy Tools - Configure as a Form, or a UserControl that plugs in to other .Net applications.

DBM (Daybreak Motor Engine) is a scene-oriented, flexible 3D game engine written in C# and XNA framework. It is designed to make it easier and more intuitive for developers to produce applications utilising hardware-accelerated 3D graphics.