Elegantt for Trello - The most elegant way to manage your Trello projects
GoodGantt - The best Gantt chart for Trello®
Hello Epics for Trello - Simplify your Trello board with parent/child relationships
Gantt - Create beautiful Gantt charts
TunnelVision - See your next Trello tasks every time you open a browser tab
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.