I see its rendering is cool I meant the engine's editor tools like handling complex animations (can be heavy in case of a realistic third person game) like the animation blueprints in UE4, or terrain tools, foliage editor, material editor, a mesh reduction feature is also handy in UE4, collision editor, skeletal mesh retargeting, how the editor represents code implemented functionalities, and additional things making game development really faster like AI related stuff (navmesh pathfinder, behavior tree editor). I mainly see great tools for 2D games, and you can find mostly 2d games in showcase too, the 3D related info is quite short in the docs, but apparently it includes really a lot of great things!