They might have specific uses that most users might not need and there may be better alternatives but some of the ones I’ve been using are:

CISO - A command line tool for making compressed ISO files that can be used in emulators and some video game consoles running custom firmware.

RAR - The Linux version of WinRAR, which doesn’t have a UI like the Windows version does.

Flatpak - Probably well known but in case a newer Linux user sees this, it’s used to download and install flatpaks from Flathub.