These are some the command line tools I use regularly and are not part of a standard POSIX environement.
Generally I prefer tools that are simple, fast and do not require lots of dependencies.
My CLI environement: I use Bash inside Alacritty with the JetBrains Mono font.
aria2
A multi-protocol downloader.
bat
A cool replacement to cat with syntax highlighting and git integration.
chezmoi
A great manager for your dotfiles. You can find my configuration files here.
exa
ls on steroids with more features and better defaults.
fd
An alternative to find which is a lot more natural to use.
nnn
A light and fast terminal file manager. I am still not sure if I prefer it over ranger though.
restic
Excellent backup tool.
Syncthing
A decentralized file synchronisation tool.