Godot Engine

• More important than the engine itself is the community around the engine. Because when you get stuck somewhere, those are the ones who will help lift you up or will abandon you. The Godot Community is extremely helpful responsive, and noob friendly!
• Unlike Unity3D with Godot you've got everything in one place. Your code editor, your 2D/3D editor and pretty much everything that has to do with the game.
• It's cross-platform. The editor itself runs on Windows, Linux and Mac. Your exported game can run on all those plus Mobile platforms: iOS, Android, BlackBerry OS.
• The assets pipeline is straight forward. Just drag and drop them into the editor and you're set!
• GDScript is a python-like scripting language and it is super easy! with amazing documentation. If you're experienced with any other programming language you can pick it up in less than 3 hours.
• You can have a scene within another scene, this way you don't step on each others' toes when working in a team! This Scene oriented design is weird at first but it won't take you long before you find out that this approach is so genius that it'll make everything else you know sound out-dated.
• I can go non stop about all the good stuff I love about it. just download it and give it a shot. the whole thing is like 40MB or something :D

[Edited by adamzahran, October 06]

Since it's FOSS, I can (and do) contribute to it to add features that I'd like to have.

A great team for a great tool. My only concern would be the size of project that, some really specific environment, could be a bit oversized.

A wonderfully dynamic alternative to Unity. I have never cried using this unlike times where Unity frustrated me forever. Its so hefty, Unity is. Godot is made from C++ so it isn't unfiltered with all kinds of excess gunk cuz there isn't that kinda stuff from the get go.

It's bones and organs. No Excess fat, maybe a little depending on how you use the software but that isn't a default thing. Not bad, just something to know any software really.

The development has often felt like a warm hug from the Godot robot for me. There's also different installer options for how you would want your package to start out as (package being the game engine). No installer neccasary! Just out the box you take it and then from there poke at it and learn its ways. There's always other options but this one has been there for me, ok. Seriously. I don't say that lightly either. I like Godot a lot. Its just refreshing to find something functional and flexible as this is, after all this time of seeing only Unity being brought up.. there's really more options than just Unity I found out in the end..

I absolutely love Godot Engine, and I love using it whenever I can. The node system makes so much sense, and GDScript is a really cool scripting language. You can also use a lot of other languages with it as well, and it's super extensible. Sometimes I can't believe something this good is also free and open source, and the community of developers and users is amazing!

A free and relatively easy to learn engine to make games. It's nowhere as bloated as Unity or Unreal and exports to every major platform, including Browsers/HTML

The best free/libre and open source game engine I ever seen!