Churchill Solitaire - The most diabolical version of solitaire ever devised. Played by Sir Winston himself. Available via the AppStore and Google.
World of Solitaire - Over 50 beautiful free web based Solitaire games. Klondike, Spider, FreeCell and more.
Treys - Like solitaire... but fun!
PySolFC - PySolFC is a collection of more than 1000 solitaire card games. It is a fork of PySol Solitaire.
AisleRiot - Aisleriot (also known as Solitaire or sol) is a collection of card games which are easy to play...
123 Free Solitaire - High-quality solitaire collection including Spider solitaire, FreeCell, Klondike and more.