Godot 3.0 game engine released
I can't say enough good things about this project. In particular I love GDScript. It's a lot like Python and it makes the cost of learning the engine negligible.You can also use C++, C# and a visual scripting language to make stuff. There's also community support for python and some other languages.It's hard to believe that it's a 20mb when Unity is 1.5gb.