Automatically update Odoo modules
Send Birthday Greetings Email to Partner/Customer
Filter databases with HTTP headers
Use the whole available screen width when displaying sheets
move some configurations out of the database
Generate Barcodes for Products (Templates and Variants)
Cron jobs/Scheduled Actions failure Log Notification & Its PDF Reports
A helpdesk / support ticket system for your website
Web: Odoo Debug Mode allows you to enable debug mode with just a click.
Configure mail servers with server_environment_files
Manage the return of your payments
Avoid 'quick create' on m2o fields, on a 'by model' basis
Enhanced zip/npa management system
A module with lots of pos reports in it, very useful.
Generate excerpts from any HTML field