Leadwerks Game Engine is the easiest way to build 3D games. With a rapid development pipeline, support for Lua and C++ programming, and plenty of learning materials, Leadwerks is the perfect way to learn to make games.
I am creating Universal a game listed on here with this engine, I have worked with unity before and for the small outlay this engine by far has better features then unity and you can produce some better graphic's.
All this and its royalty free, I upgraded to the standard edition so I can use C++ and Lua scripting side by side.