FarmVille - FarmVille lets players cultivate their farms by plowing, planting and harvesting crops and trees.
MySims Kingdom - MySims Kingdom is based upon The Sims series but provides special and extremely different gameplay to the original series making it definitely worth your consideration.
Farm Up - Farm Up is a marvelous, Action, Farming, Social Interaction, Single, and Multiplayer Simulation created and published by Realore.
YoWorld (Yoville) - YoWorld or formerly known as Yoville, is an Action, Browser-based, MMO, RPG, Single-player and Multiplayer, Social networking, and Virtual World Simulation developed by Big Viking Games.
Hay day - Farm with friends and family
Tinierme - Tinierme is a Massively Multiplayer Role-playing, Fantasy, Virtual World, and Browser-based Life-Simulation.