What are some alternatives?
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.
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
KanbanFlow - KanbanFlow is a Lean project management tool allowing real-time collaboration between team members. Supports the Pomodoro technique for time tracking.
Basecamp - A simple and elegant project management system.
Zenkit - Zenkit is the home you always wanted for your ideas, your projects, your business.
Kantree - Kantree is an adaptable and intuitive project manager for the enterprise.