Just to note, that Defold won't be open source:

> GamesBeat: Is this going to be open source? Hartwig: It’s not open source, but it’s free of charge. There are no royalties or team size limitations. You get all the features on all platforms. For us, the main driver—There are two reasons. One, we believe that opening the engine up to external developers will increase our product quality. That will benefit us internally when we develop our games. Two, we want to support the game industry. We think we can bring a lot of value to the whole industry by helping indie developers create awesome games.