SimplyRAR is an easy-to-use file archiver for your Mac.
One of the problems with RAR archivers for the Mac like RAR - which is essentially the same as WinRAR, except for Macs, obviously - is that they often come without any kind of graphical user interface, meaning it's difficult for new users to install and use them.
As the name suggests, SimplyRAR is a very easy to use archiver that makes archiving and unarchiving files a breeze. Opening archives is as easy as simply browsing to them, and SimplyRAR instantly displays a log of the results. The same goes for archiving RAR files on SimplyRAR. Even easier is the fact that - as in Windows with the WinRAR free download - you can simply right click on an archive to zip it up or unzip it.
Unfortunately, the developer of SimplyRAR doesn't seem to be in business anymore, meaning it will be difficult to get support for this app if you have any problems. It's possible that the SimplyRAR license holders of the RAR protocol have "banned" this app which is possibly why the developer has disappeared. There have also been some complaints that it uses a lot of RAM.
SimplyRAR is one of the easiest RAR archive tools out there on the Mac.