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
Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.
GoodGantt - The best Gantt chart for Trello®
Corrello - Dashboards for agile teams using Trello
Instagantt - Instagantt is a powerful and intuitive Gantt chart tool to enable teams to plan, manage and visualize their projects easily. Manage your schedules, tasks, timelines, and workload like a Pro. Try it for free.