I am happy to post here on BlenderNation about Armory - an open-source(zlib) 3D game engine for Blender. The goal of Armory is to turn Blender into a complete game development tool. As a quick introduction, I have recorded a video of me playing around:
Thanks to the underlying tech, Armory exports your games to almost all the platforms - Windows, Linux, MacOS, HTML5, Android, iOS, PlayStation 4, Xbox One and Nintendo Switch. The engine is available right now - currently as a paid add-on. Armory has been in the works for years now, to move things to the next level I am opening a campaign to fund the development and make it fully free - in the same spirit like Blender is.
If you like what you see consider supporting us on Patreon. I would also love to hear your feedback on how to make Armory useful to you! :)