What UnRar utilities are available for Mac OS X?

If you like to work on the command line, the unrar utility is available via homebrew - you can install it with:

brew install --cask rar

The Unarchiver works rather well for most .rar files — it might have issues with password protected or split archives though, at least in some older versions.

It supports a large number of archive formats and is as easy to use as BOMArchiveHelper : Double click and it extracts.

The Unarchiver does that. You can also set it to open the files after extraction. Just open The Unarchiver.app after you've installed it, if you ever need to change the settings again.