Previously an in-house game engine solution, Godot seems a powerful game development environment. It deploys to several platforms such as Windows, Linux, Mac, Android, iOS, BB10 and HTML5. The team has fully open sourced it under an MIT license.
From their website:
Godot Engine has been developed as an in-house engine with a track-record of more than a decade of published games. It took a long time but it’s finally ready for everyone. Godot brings to the table a large array of features and a different approach to making games, which combined allow single developers and teams to be more efficient than ever.
Godot is a fully featured, open source, MIT licensed, game engine. It focuses on having great tools, and a visual oriented workflow that can export to PC, Mobile and Web platforms with no hassle. The editor, language and APIs are feature rich, yet simple to learn, allowing you to become productive in a matter of hours.
Godot is BETA. Collaborate!!
Having been developed as in-house means that the user experience may still not be ideal for everyone. The features needed to make a great game are there, but we really need your help to fix all the rough edges and improve usability (via feedback and/or code contributions). We know we are close to having an awesome, open source, game engine with nothing to envy from the best commercial offerings, but we can’t do this alone. This is why Godot is now open source, so everyone can help us reach this goal.
I'm very curious how compatible this tool is with Blender. Is anyone up for a quick test and/or tutorial?