KanbanFlow - KanbanFlow is a Lean project management tool allowing real-time collaboration between team members. Supports the Pomodoro technique for time tracking.
Planyway - Visual project management for Jira and Trello: manage resources, build project roadmaps, use time tracking.
Kantree - Kantree is an adaptable and intuitive project manager for the enterprise.
Kanbanote - Turn your Evernote into Trello
Kanban Tool - Simple and effective online application for visual project management.
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.