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Open MUGEN aims at becoming the new 2D fighting game engine.
Multiplatform, open-source and old MUGEN compatible, it will enable you to play any fighting game as Street Fighter with characters, rules and mode of your choice.
NewWolf is a conversion of a famous 3D action game: Wolf3D
by ID software. The purpose of this project is to make a stable, extencible and portable 32bit version of Wolf engine. To allow users run it in different resolutions and on various platforms.
Its turn based, web-browser, fantasy MMORPG written in PHP and MySQL (but may work with many other databases) with Smarty Template Engine, ADOdb and PHP Mailer. Based on Vallheru version 1.0 with many modyfications in speed and features.
A decentralized MMORPG modelled after the world wide web such that anyone can host a world on his server and link it to other worlds in the web. It also differs from other such games because its focus is on puzzle-style quests instead of monster killing.
Revenge of the Knights is an ambitious RPG game in FF-style written in C/C++ using Ogre engine. With a gorgeous story, it aims to be one of the best free RPGs on the net.
QMM (Q3 MultiMod) is a plugin manager for Quake 3 that sits between the Q3 engine and the actual game mod to allow pseudo-mods to be dynamically loaded adding new functionality to a Quake 3 Mod. Similar to MetaMod for HalfLife.
Moving to Github (https://github.com/thecybermind/qmm2)
A strategic turn-based game, based on Battle of Wesnoth engine, to make to live again the ancient Glory of the Celts, where the respect for the nature and the observance of the mystic was stirred in the life every day.
Our ambition in this project is to use Blitz to design a free 3D open source game creation system that is easy for the beginner and powerful enough for the advanced user.
...GUSANOS improves greatly on what the original Liero left, adding modern graphics, audio and networking capabilites along with a myriad of other features.
The GUSANOS engine is fully moddable. It achieves this in a Quake-like fashion, so that each mod lives in its own folder without messing with the core game files.
AfA-Scumm is the 2D adventure engine powering AmberfishArts, a community for enthusiasts of classic adventure games as well as a hub for high-quality fan projects. Coded in C++, AfA-Scumm is both very portable and feature rich.
JAMIE (JAva Mud Implementing Engine) is a text-only, telnet-based MUD server written in Java. It provides an original experience-less and level-less job-based system that can be expanded by those who wish to run their own MUD.
FurionMUCK is a modern MUD server based on TinyMUCK and Fuzzball extensions. It uses a MySQL driven backend storage engine for improved reliability, functionality, scalability and stablity.
EleiDras is a dinamic MUD engine whith unsurpassed freedom. User can grow his characers in many different ways an can choose almost every path. And every action cuold effect the world.
Luciferino is a sidescroller game engine, that allows you to create your own sidescroller without any programming knowledge (you'll only have to read a pair of tutorials to understand the data files format).
RPG Action Game that takes a satirical look into the life of a fictional IT professional working in a corporate Cube Farm. The game engine is written in C++.
CrystalBlend is a game engine integrated with Blender based on Crystal Space. It is an alternative for the currently existing but outdated GameBlender.
Eleconics is a Java-based cross-platform multiplayer only strategy game. Players create fleets of customized ships and control them in an fully 3D environment powered by the Xith3D engine. Players will compete through email, TCP/IP and "hotseat" methods.
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.