Cockatrice - Cockatrice is an open-source, multiplatform program for playing tabletop card games over a network.
StickerPop API - Embed all the best stickers and GIFs into your apps.
Hearthstone - Pick up your cards and throw down the gauntlet!
Zimit - Configure price quotes for services
XMage - XMage allows you to play Magic against one or more online players or computer opponents.
Acrylic Charms by Sticker Mule - Add some charm to your life.