On macOS my daily driver is Nimble Commander (https://magnumbytes.com/). Super fast, powerful and inspired by Total Commander. It used to be paid but now is free and open source so give it a try. It deserves to be better known.
There was this tech [1] making rounds on HN a while back. Made a big impression on me and it's by the company that co-created the World of Goo 2. I wonder if it was used to make the game.
Nebula was the tech that I watched very closely and it inspired me a lot. It was back in the ancient year of 2000, if I remember correctly, when our game was being published by CDV and I just learned about Project Nomads, based on Nebula. Beautiful engine and I loved the clean, simple and extensible architecture.
I would love to have such tech nowadays, but focused on 2D/light-3D mobile games :)
Yes, Nimble Commander is wonderful. The developer took a lot of care and created a powerful and very fast tool. As a long time user of Total Commander on Windows I'd be crying sad tears if I had to limit myself to the basics that Finder provides on macOS.