Solitaire Planet is described as 'immersive and highly configurable 3D solitaire collection for the desktop and mobile. Enjoy a whole world of solitaire games. Escape for minutes or for hours, you can always come back for endless entertainment'. There are more than 25 alternatives to Solitaire Planet 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 Solitaire Planet are PySolFC (Free, Open Source), AisleRiot (Free, Open Source), Solitaire.gg (Free) and World of Solitaire (Free).
Play Solitaire with this simple game! Currently you can play AcesUp, Canfield, Forty&Eight, FreeCell, Golf, Grandfathers Clock, Gypsy, Klondike, Mod3, Pyramid, SimpleSimon, Spider, Tripeaks, Vegas and Yukon. If you want me to add more games, please tell me.
Aisleriot (also known as Solitaire or sol) is a collection of card games which are easy to play with the aid of a mouse. The rules for the games have been coded for your pleasure in the GNOME scripting language (Scheme).
Solitaire.gg provides a huge collection of solitaire games including Klondike, FreeCell, Spider and many more. The entire collection is open-source and also playable online with just the right amount of options to configure basic settings and appearance.
200 card games (Freecell, Klondike, Fan, Spider, Pyramid, Gaps, ...). Games layout and rules are declared in XML format. User can add his own cards and background BMP images. Right-click moves a card to the most suitable cell according to game rules.