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htop is written in C: https://github.com/htop-dev/htop

Maybe they meant to mention "bottom" instead? https://github.com/clementtsang/bottom

Eventually some of those tools, being universally useful, should be installed by distros by default. I think rg and fd are great candidates (the fact that grep and find exists isn't an impediment; unix traditionally had sed and awk alongside grep)

surprised not to see fzf

also someone showed https://github.com/console-rs/indicatif/ recently (a tqdm like progress bar)

You can use https://crates.io/crates/skim