Pretty Good Solitaire is described as 'You will enjoy countless hours of fun with Pretty Good Solitaire. Play 550 different solitaire card games, from classic games like Klondike, FreeCell, and Spider, to original games Demons and Thieves and Aces and Kings'. There are more than 25 alternatives to Pretty Good Solitaire for a variety of platforms, including Windows, Android, iPhone, Android Tablet and iPad. The best alternative is Simple Solitaire Collection, which is both free and Open Source. Other great apps like Pretty Good Solitaire are PySolFC (Free, Open Source), BVS Solitaire Collection (Paid), AisleRiot (Free, Open Source) and Solitaire.gg (Free).
At Solitairegamesnow.com you can play Solitaire online in your Browser - for free. Among them Spider Solitaire, Mahjong Solitaire, Freecell Solitaire and much more. There are currently over 120 different solitaire games available.