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CoffeeMud is a text-based virtual reality game engine (a MUD). It is a mature, full-featured Java codebase. It includes web (HTTP) and email (SMTP) servers, chat (IMC2 and I3) and web clients, and supports ANSI, MXP, and MSP.
A browser game framework implemented with Grails. The goal of Little Goblin is to create a game engine that allows you to "just add content" and you will be able to host a game that is only limited by your creativity.
Free MMORPG Engine. Develop and host graphical browser-based games.
...It lets you develop and then run or host browser-based, graphical multiplayer games. The users will play games simply via their browser.
DimensioneX runs on any Java-enabled webserver (eg. Tomcat)