GanttPRO - GanttPRO is online Gantt chart software for project management. CEOs, project managers, and teams use it every day to solve project management challenges.
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.
OnePager Pro for Microsoft Project - OnePager Pro builds Gantt charts, timelines and multi-project reports using data from Microsoft Project, Project Online, and Project Server.
GoodGantt - The best Gantt chart for 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.
Paws for Trello - The best way to use Trello on your desktop