GoodGantt - The best Gantt chart for Trello®
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.
Gantt - Create beautiful Gantt charts
Gantt Charts for Zenkit - Track & manage complex projects with a Gantt chart in Zenkit
Paws for Trello - The best way to use Trello on your desktop
Online Gantt - A free MS Project alternative for simple gantt charts