If you like those, using cdr within zsh is amazing. It automatically keeps track of where you’ve been, and you can set up tab completion to show the history with a number next to each directory for easy switching.

Iirc, that was my main reason for switching to zsh a few years ago

I love ranger. Mostly I just use the basic shell, but when I’m doing a lot of random file transfer, seeing what I’m doing with ranger is nice.

It’s super fast and intuitive if you’re already into vim and vim-style keybindings.

There’s a discussion about this on lwn (relevant part starting around this comment). My understanding is like @fayo said: you can pull this “trick” of releasing their source code, but only once (assuming they catch you).