Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

FarmVille - FarmVille lets players cultivate their farms by plowing, planting and harvesting crops and trees.

Drag for Gmail - Transform Gmail into organized To Do lists (like Trello)

Big Farm - Big Farm is an Awesome, Browser-based, Farming, Single, and Multiplayer Simulation created and published by Good Game.

KanbanMail - A Kanban board for your emails.

Farm Up - Farm Up is a marvelous, Action, Farming, Social Interaction, Single, and Multiplayer Simulation created and published by Realore.