help with .7z files on a mac

I'm really struggling with these files.
I have read the tutorial, however it only really covers PC's, also the link for an OS X file on that page is no longer working.
So if anyone could post a simple, easy to use program for extracting .7z files on a MAC I would be very grateful.
thanks

Have you try this onehttp://www.qweas.com/downloads/system/file-compression/overview-7-zip-for-mac.html