Trello

Trello is a web-based Kanban-style list-making application. It allows users to keep boards that hold cards representing tasks and that are organized in different columns. Each column typically represents a state which tasks have to go through, namely "To Do", "In Progress", and "Done".

By allowing tasks to be visual and easily accessed by other team members, Trello boards are helpful to keep projects organized. Some useful features are: card labeling, user assignment, and the ability to define deadline dates.

More advanced uses of Trello can include extra columns that contain additional, quickly-accessible information to help keep team members on track.

Mostly used by program management, to help organize activities for the duration of a program.

Check notable examples here and here