Timepot timer for Chrome - Track time & projects across your tools
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 Charts for Zenkit - Track & manage complex projects with a Gantt chart in Zenkit
GoodGantt - The best Gantt chart for Trello®
Office Timeline - Make impressive PowerPoint timelines with just a few clicks.
Paws for Trello - The best way to use Trello on your desktop