http://easybacklog.com is a backlog management tool. It is fundamentally different to many existing tools such as Pivotal or Sprintly in that its focus is to provide scrum masters and product owners with a tool to estimate, and manage the delivery of a project as opposed to the ongoing endless development of a business. This type of workflow is needed for freelancers and agencies who are typically trying to deliver a service at a fixed cost or fixed scope. Easybacklog provides tools to compare the backlog at points in time and thus renegotiate at each sprint with the client in regards to scope or price.
I have thousands of active users and have asked many of them whether they would be willing to pay, and they are. Unfortunately I just don't have the time now or for the foreseeable future to add a few highly requested features and billing systems for the product. This is an ideal product for someone to pick up, add a few of the really needed features, and start charging existing happy customers.
Get in touch with http://mattheworiordan.com if this interests anyone who has some time to develop a Rails / Backbone application, and wants to create a revenue stream for themselves very quickly.