Rar for Linux is something that exists, is free of charge, has no trial pop-up, and is basically the same thing that one runs for you. Also, 7-Zip can run it for you if you want to use a GUI.
7-Zip is a stupid name and I refuse to use it even if it's better than WinRAR. Not like I ever open the interfaces anymore. I just right click and "extract here" so I don't even know what to compare.