Metacello is a package management system for Monticello that uses configuration files to define project versions and dependencies. A configuration file specifies the Monticello files, dependencies on other projects, and dependencies between packages for a project. Metacello is intended for users, not developers, of a project and allows users to load projects and specify pre and post code execution and project references. The current version is 1.0-beta.27.4 and future plans include improving version naming, validation, and ongoing bug fixes.