I am interested in how games can be used in learning. Pablo recently announced the release of the e-Adventure engine. This is an adventure game authoring environment and engine for building educational games or simulations. It includes an assessment component and can integrate with an LMS that supports IMS-LD. It also supports adaptive learning and it is Open Source.
Another interesting project I just discovered is Platinum Arts Sandbox. The goal of this project is focused on using the platform to teach kids how to make games. This is a fully 3D game engine and again it is Open Source.
Right now, it looks like the project with the most momentum is Scratch, a platform for creating and sharing games. It is very easy to use and you can get some interesting and fun results very quickly.
You may request notification for Solution Grove Blog.