If you want one with a similarly styled UI, it's DaisyDisk.
Also available on the App Store but the sandbox requirement adds a minor annoyances with allowing it access to your disk.
Personally I find the big grid style visualizations make it easier to actually find large files that I don't need, like what you get with WizTree on Windows, but I'm not sure there's a current Mac option. I think DiskInventoryX is gone, but maybe Grand Perspective is still around?