Yes is called hammer, very similar two Dark Radiant but more advanced but in some ways you will feel at home with it. Btw is similar because Valve used a modified quake 1 engine to do Half Life 1 and when they made Source 2 and its new hammer editor, they kept many of the characteristics of the old Quake based editor.
I've used it before and let me tell you that is a awesome tool, personally decided to go to idtech 4 only because, I loved Doom 3 and because of the better real time per pixel lighting support but there's things that hammer can do that DR still can't, like it has a advanced patch system that makes it very easy to make complex terrains.