I have the pleasure of working on Unreal, Epic Game's commercial game engine. Unreal is a powerful tool, capable of building titles for both small indie teams and big name studios. Some of it's features include AI behavior trees, particle effects, physics, animation blending, real-time rendering, ray tracing, and more.
With the announcement of Unreal Engine 5, a new generation of gaming is just over the horizon. You can check out the tech demo here. You can also enjoy my personal favorite sizzle real from 2017, which showcases many of the games that use Unreal Engine.