The document describes Boxen, an open source tool for managing development environments. Boxen uses Puppet to automate the installation and configuration of common developer tools like Xcode, Ruby versions, Node.js versions, databases, and other tools. It allows developers to get set up quickly by running a single command. Boxen also supports managing personal preferences and project-specific configurations through custom manifests. The tool provides a consistent, repeatable environment that makes it easy for new team members to get up and running.