Pivotal Tracker is a shared, predictive, collaborative to-do list and project management tool used by thousands of teams for agile software development. It automates aspects of the agile process like prioritizing work, estimating story points, tracking velocity, and integrating with source control systems. Stories represent features or bugs, are broken into tasks, and flow through a workflow as they are developed, tested, and accepted. The tool provides visibility into progress and predicts future iterations based on historical performance.