Unar is described as 'The Unarchiver is a macOS app, but the underlying unarchiving code can run on other OSes, too. There is not yet any GUI app for any other OS, but there are two command-line tools, unar and lsar, which can be used on macOS, Windows and Linux' and is an app in the File Management category. There are seven alternatives to Unar for a variety of platforms, including Mac, Windows, Linux, BSD and Haiku. The best alternative is The Unarchiver, which is free. Other great apps like Unar are ArKiwi (Free Personal), RAR Expander (Free, Open Source), Unarchiver One (Free) and Elimisoft RAR Extractor (Free).
ArKiwi, formerly known as Archivaldo, is a lightweight and very fast file archiver, where you can add, compress, extract, delete, password protect, and blazing fast search all your files. in a compact binary file system called ARA (ArKiwi Resource Archive).
Best free compression, encryption and archiving tool for mac and Windows. Unrar and Unzip files in seconds | Unarchiver One can open and extract archive files including RAR, Zip, 7z, gzip, bzip2, ISO and more fast and easily.
Effective app designed to decompress archives, like RAR, Zip, 7z, Tar, Tgz, Cbz, Lzh, Lzma, Bzip, iso, HFS, VHD, etc. Supports over 50 kinds of archive files, as well as extract encrypted archives entirely.
unrar (or unrar-free in some Linux distributions) is a free software version of the non-free unrar utility that exists on many GNU/Linux systems today. It uses the GPL'd UniquE RAR Library by Christian Scheurer and Johannes Winkelmann.