Solkan Solitaire is one of the most complete collections, and best of all it is completely free with no restrictions or advertisements.
Solkan Solitaire includes nearly 200 different games, including Quilt, Clock and other popular but hard-to-find games. Solkan uses six different sizes of card decks to let you see the cards no matter what game or what system you play on. Solkan is the only suite to adjust the size of the cards depending on which game you play. Solkan cards automatically resize from four times as small to twice as big as the cards used by most other packages.