I discovered Gravity in Google Chrome Web Store. It is a simple and elegant project management software for Agile team.
Projects
User can create up to 3 projects. At time of writing, Gravity is finalizing the paid subscription packages. User can sign up with Google / Google App account. After creating a new project, participants can be invited to join the project. Each participant can be classified in one of the following roles: Spectator, Participant, Manager.
Stories
Stories can be created and assigned to participants. Multiple stories can be grouped into user defined categories (e.g. Web, API, Mobile client). Multiple acceptance tests can be created for each story. Each acceptance test can be marked as “Passes” or “Fails”. Multiple tasks can be added to a story. It is presented as a checklist, where user can check the checkbox to mark the task as completed.
Iterations
User can define iterations. By default, each iteration last for 2 weeks. Each iteration has a cost value, which is the total cost of stories assigned to this iteration. Each story will be assigned a cost value (default 3). Stories can be either schedule in the backlog (unscheduled), or one of the iterations.
Kaban
Gravity has a Kanban feature called Task Board. It has 4 stages: To Do, In Process, To Verify, Done. Tasks within each story will appear on the Kanban board. Each task can be dragged across the Kanban board by using a mouse. I think this is a wonderful feature. Kanban is a useful tool for team to review and optimize its process.
Reports
Various information (i.e. story cost, stories burn down, task burn down) are presented in the form of charts. This feature give user a visual summary of the performance of the team.
Issue/Bug Tracker
Besides the story/task management, Gravity also comes with a simple issue tracker. Each issue has 4 attributes: title, description, category, severity. To facilitate searching of issues, it has a filter feature where user can filter the issues by a combination of different criteria.
Opinion
Gravity is very simple to use. It uses AJAX to make user interaction smooth. It is suitable for Scrum/Kanban team. Gravity offers more features than Pivotal Tracker. If you like Pivotal Tracker and want an integrated Kanban/Issue tracker, you can consider Gravity.