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.

Hay day - Farm with friends and family

KanbanFlow - KanbanFlow is a Lean project management tool allowing real-time collaboration between team members. Supports the Pomodoro technique for time tracking.

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

Meistertask - MeisterTask is an intuitive task management and collaboration tool.

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