Trello is the free, flexible, and visual way to organize anything with anyone.
A Trello board is basically a web page containing lists laid out horizontally on the page so you can get a bird’s eye view of your project. Items within the lists, called cards, can be dragged and dropped onto other lists or reordered within lists.
Individual cards themselves can contain checklists, images, attachments, deadline dates, colored labels, and discussion notes from others who share the board. You can have as many boards as you want—one for “House Stuff,” for example, one for “World Domination,” and so on.