[darek]

I've been using Nimble Commander for a while now. Snappy, similar to Total Commander on Windows and I love it. The developer recently made it open source and published the code on GitHub here: https://github.com/mikekazakov/nimble-commander

I'm not sure if that's the kind of open source you were looking for, but may be worth checking out.

[pbalau]

Total Commander is the best piece of software I ever used! I even bought a license for it, they sent me a cd with an installer and the license and I promptly lost it. At some point i even had tc as a replacement for the Windows shell. These days i dont care that much about where my files are, I have a "work" folder and thats that. My music is on spotify, my videos on netflix/amazon prime/now tv, i dont take that many meaningful pictures anymore and I dont see a reason to care about files anymore. But Total Commander was my life for a very long time, along with piracy :-P

[vbezhenar]

Wow. When I used macOS, I used this manager a lot and it's awesome. Now Open Source, it's even more awesome.

[tambourine_man]

I didn’t know it was made open source either. Great news.