Hello Epics for Trello - Simplify your Trello board with parent/child relationships
Elegantt for Trello - The most elegant way to manage your Trello projects
HiddenMe - Hide desktop icons with a single click.
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.
Momentum - Agile goal and performance management
GoodGantt - The best Gantt chart for Trello®