The document discusses several Grails plugins:
1. The Mail plugin allows sending emails from Grails applications. It can be installed and configured with Gmail SMTP settings.
2. The Quartz plugin schedules jobs to run on intervals or cron expressions. Jobs can be defined with triggers and executed.
3. The Console plugin provides an interactive Groovy console for debugging applications. It uses local or remote storage.
4. The Database Migration plugin helps manage database changes with Liquibase. Changelogs can be generated from domains and synced to the database.