ripgrep is a reimplementation of grep in Rust. It benchmarks faster for large file searches and also comes with quality of life features like syntax highlighting by default.
Ncdu is a really useful little utility that shows you what directories are using the most space on whichever drive/directory you select. Really useful little piece of software.
hdparm is another neato one that let's you test the read speeds of your drives, though it's more so something ya use once and forget exists.
Also, though Neovim is more popular, Helix deserves some recognition. It's a rust based, vim inspired text editor which removes the need to configure it, making it easier for people trying to get into terminal text editors.
I basically live in nvim. Being able to configure my editor in an actual programming language makes it so much more useful to me than vim could ever be.
Yes, Vimscript is way more intuitive than Lua in a lot of ways. And as far as programming languages go, Lua has some strange design choices that I'm not the biggest fan of, either. However, it really does open up a lot of possibilities when your configuration is programmatic.
I have mostly replaced all command line stuff with Emacs, but there are still a few CLI utilities that I continue to use, whether I am in the CLI directly or whether I am using Emacs:
ranger and mc - both are file managers, and their approach is so different that I choose one of them I need at the moment depending on what do I want to do (mc for traditional file management, ranger for looking around the directory tree and peeking into files)
htop, tmux - classics
weechat, profanity - for my IM needs
ripgrep - for searching through files
magic-wormhole for file and ssh public key exchange
mosh for when the network conditions aren't ideal
nmap to see if that machine I've connected into the network is up and what IP did it get
Kakoune (kak) has become my go to vim replacement. Keybinds are tweaked slightly to be more user friendly and more transparent about what it is you're doing.
I never mastered vim binding as well as I liked, but the more intuitive and better communicated binds for kak were easy to learn in comparison and I quickly swapped over.