The AWS OpsWorks Cookbooks repository provides the built-in Chef cookbooks used by the now-deprecated AWS OpsWorks Stacks service, a configuration-management and application-deployment service that used Chef (and optionally Puppet) to manage fleets of EC2 instances. These cookbooks implemented standard tasks such as package installation, web server configuration, database setup, Ruby/PHP/Java application deployment, and integration with AWS stack lifecycle events (setup, configure, deploy, shutdown). Customers could use these cookbooks as-is or extend/override them by supplying custom Chef recipes. Although OpsWorks Stacks reached end-of-life in May 2024, the repository remains valuable for teams still running legacy stacks or studying Chef automation patterns in an AWS context. The repository includes multiple branches to support different Chef versions (11.10, 11.4, 0.9) and provides reference implementation of layer recipes, attributes, and templates.