Feature-flow is an agile practice for organizing work around units of value rather than time.
The Valuenator application, implemented here, provides a tool you can use to implement the practice.
Checkout the documentation to learn more.
The software is currently in an alpha state. You can try out a demo version that stores data persistently in your browser. It currently requires Chrome. We'll be adding support for other browsers soon.
We'll also be announcing a beta for an on-line version soon.