fly earth chung is a free 3D flight / car / shoot simulator using google earth geplugin, javascript and freebasic. Explore the world in plane,car or feet. Include a freebasic exe application for sound/joystick interface and web launcher.
WARNING: due to google earth plugin deprecation this should no more work from december 12 2015
http://googlegeodevelopers.blogspot.fr/2014/12/announcing-deprecation-of-google-earth.html
Free MMORPG Engine. Develop and host graphical browser-based games.
DimensioneX is a free Massive Multiplayer Game Engine.
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 web server (eg. Tomcat)
Underworld is a massive multiplayer online role playing game (MMORPG) based on web technologies, so it can be played with any web browser. It is a fantasy game in which the player can be either a human or a monster: combats, spells, buy/sell items
Generate interest, access liquidity without selling, and execute trades seamlessly. All in one platform.
Geographic restrictions, eligibility, and terms apply.