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FreeMMG 2 is a C++ game network engine based on a hybrid client-server and peer-to-peer overlay network, aimed at supporting avatar-based games (RPGs or shooters) in a massively multiplayer context.
The 'Nameless Allegro Engine' is a several layers of C++ abstraction. It is intended to abstract the entire game development process all the way from Allegro to the finished game.
NiL is a modular multi-purpose gaming engine including a multiplayer worm game a little like quake, except it's 2d and a little like worms except it's realtime.
A platform independent, C++ game development framework. Not a game library, but highly flexible "scaffolding" upon which to construct a game. This project has been superceded by the Golem Engine. https://sourceforge.net/projects/golem3d/
A source framework and runtime library for building game engines; providing windowing, input, sound, and networking; in a simple, platform-independant manner. Utilizing C++, OpenGL, and various native APIs to provide a platform-transparent system.
NUSoftware GameEngine is a framework used for games development. A simple API to easily create games using advanced 3D graphics & sound systems simplified for the average programmer.
A C# engine for the popular MineSweeper style puzzle game. Easy to extend and integrate into new projects.. See the engine in action: http://www.kongregate.com/games/pintsized/electronminefield
KERN is a C++ based gameengine which is suited especially for 2D tile based games. It provides basic mechanisms and different renderers, so that a single level file is able to be viewed from different perspectives, like topdown or isometric.
A flexible, modular gameengine that can make use of different components (internally developed or existing external libraries) to implement subsystems such as graphics rendering, AI, audio or physics.
PIEngine is a general purpose 3D gameengine designed to be an easy to use framework for game developers. It glues together OGRE, ODE, OIS and some other common parts of an engine.
The Adventure System (or TAS for short) is a gameengine, which handles rendering, sound, scripting, networking and a host of other features required to develop a game.
Intended to be a cross-platform 3D engine and toolkit using the Tao framework and allowing C#/F#/.NET developers to target Mac OS X and Windows with a single build.
Also includes accessory tools for managing builds and ports of your game product.
An engine and meta-model for building role-playing games. Allows the developer to focus strictly on the model (or "world" of the game) and the interactive experience for the end-user.
Leadwerks Arena is an open source first-person/third-person arena game for online play between players. It is a community created tech demo for the Leadwerks Engine 2.1 and showcase of Phoenix.Framework.
Project Elemental Shattering (ES) is a role-playing game that has been in the design phase for many years. Its first incarnation is this MUD engine. A successful MUD project will lead to the inevitable graphical MMORPG!