I wonder if anyone heard about.

Originally developed by Okam Studio; Godot Game Engine is an advanced 3D/2D game engine/editor, export to Linux, OSX, Windows/WinPhones, Android, iOS and some consoles (not publicly available, because console's SDK aren't) and HTML5 on redo (switching from emscripten to webasm)

License: MIT. Take the editor/engine/binary/sources and do whatever you want. Absolutely free of charge

it's member of Software Freedom Conservancy, and it comes with it's own GDScript: a programming language which is clean, simple and powerful and already lot of demos to start study it.

Other than the online help (directly in the editor) there's a wiki and some video tutorials

Gamefromscratch's playlist

Generic godot tutorial's playlist

Also this youtuber made several tutorial about Godot

Showcase playlist

Editor download are for Windows, Linux e OSX

http://www.godotengine.org/projects/godot-engine/documents

I noticed several games made with Godot Engine here on itch.io, but when I tried it for myself... well, suffice to say it's just not my thing. I'd much rather code stuff from scratch. But yeah, it's an option worth knowing about for people willing to look into it. The more choice we have as developers, the better.

Well, it's all about the features you need and the time you have to develop them.

Godot comes already with advanced 3d engine and lot of features like global illumination and such.

The best things about Godot, compared to other game editor/enigine is that's given in a free Mit license, which doesn't set any kind of limitation/share. Also, if you got the skill, you're also enabled to modify the engine's sources (and not required to, but you still can, share the sources of it, such has is required with GNU license)

Using Godot for my current game, and I have to say it's amazing. Its features are wonderful and easy to work with. And yes, it does work flawlessly on linux. Only had one crash when I had 2 games loaded up in the background for whatever reason.