We've built a very nice platform to create, publish and play HTML5 games using just a browser, called Gameleon. The overall idea is to have everything built visually, online, using a browser. You can download the platform's virtual machine running a MMORPG server, and publish the content from the cloud onto the system with a single click. In many ways, from administration, to publishing and even monetizing, this is "WordPress for game creators" Furthermore, this is Open Source. The realm itself is open source and we want to release an API to integrate with the editor, to add your own functionality and features to it. If you're thinking the games can run just in the browser, we have some nice experiments on the pipeline aimed at exporting native apps for iOS and Android. You can find out all about us visiting our homepage or our Kickstarter campaign.