Lots of neat #Rust cli tools on this thread:
https://www.reddit.com/r/rust/comments/16g38gp/what_are_your_favorite_simple_open_source_tools/
I discovered Atuin (shell history browser similar to fzf), bottom (a fancy clone of top) and delta (augmented diff tool for git and more).
I was already using these: fd (better find), rg (better grep), lsd (better ls), bat (better cat with syntax highlighting etc).