FreeCell (also known as Microsoft FreeCell) can be found on Windows computers (Windows 95 up to Windows 7) and now comes on Windows 10 as Microsoft Solitaire Collection which unfortunately includes ads, etc., though a paid version is available for $10 a year.
My preference, and a great work-around can be found here and allows you to upload the classic FreeCell game and others–no strings attached. It is the one I use and set up for others.
For the Mac, please go to download.cnet.com/Freecell or Mac App Store. Because FreeCell is a Microsoft product, it plays better on Windows. For a paid version ($4.99) with 8,500 ratings (4.7), please go here.