Godot Engine now open source
Have not had a chance to delve into this, but it is intriguing. Comes with the disclaimer that this is their internal tool so might be a bit lacking in the UX dept. But that's the whole thing about open sourcing - if a community forms around it, it will grow and improve.
http://www.godotengine.org/wp/
http://www.godotengine.org/wp/
Comments
It can't build for iOS yet... That's apparently coming soon.
It uses it's own language called GDScript, which at first glance seems like Python with a couple keywords changed. The engine already has support for switching languages (although GDScript is the only choice at the moment), and there's a page for a tutorial that's yet to be added for "Adding a new scripting language." It's also got it's own built-in shader language, which is a simplified subset of GLSL. It can apparently also be extended by modules written in C++.
Going through the list of tutorials they plan on doing, it looks really promising, although two thirds of them aren't available yet. The basic tutorials are all there (loading resources and creating a 2D game with animations and a GUI), but there's pretty much nothing on any intermediate or advanced topics. There don't seem to be any tutorials at all for 3D yet. Hopefully a community forms and starts fixing up the documentation.
EDIT: Anyone who want's to get into it, but wants more documentation, be sure to have a look at this reddit thread.
http://www.godotengine.org/article/godot-engine-reaches-2-0-stable
Things that this has that I'd really like in Unity:
- Prefabs within prefabs. Been promised this by unity forever.
- Scene inheritance
- Multiple scene editing. Unity has added a weird additive scene editing feature, which I can see as being useful in some cases, but what I really want is just tabbed scenes like Godot has.
- Live editing on devices. I saw a plugin for Unity that let you tweak a few things remotely but it wasn't close what remote full scene editing would give you.