Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
BMC Software - BMC Software is a solution for companies to help them in running and reinventing their businesses with scalable and modular solutions to IT problems and management.
Basecamp - A simple and elegant project management system.
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.
Redmine - Flexible project management web application
Kanban Tool - Simple and effective online application for visual project management.