admin/plugins
From MoodleDocs
An administrator can obtain an overview of all plugins installed on the site in Settings > Site administration > Plugins > Plugins overview.
Note: You are currently viewing documentation for Moodle 2.0. Up-to-date documentation for the latest stable version is available here: admin/plugins.
An administrator can obtain an overview of all plugins installed on the site in Settings > Site administration > Plugins > Plugins overview.