Cri's Spider is a free spider solitaire game. Free and no ads, just the game.
I wrote it as a birthday present for my wife, and then we agreed that it was nice to make it available to everyone.
Spider solitaire uses two decks of cards and a tableau of ten stacks.
The Spiderette version of the game is just Spider with one deck and a tableau of eight stacks.
There are three difficulty levels: hard uses four suits, medium, two suits, and easy only one suit.