For Website Owners

1. Yoast SEO – Search Engine Optimization
2. BackupWordpress – Automated file and database Backups
3. Wordfence – Security
4. Gravity Forms – Contact Forms
5. W3 Total Cache – Improve the speed of your website using caching

For Web Designers

1. MainWP – Manage Updates for many WordPress websites
2. Advanced Custom Fields – Great for developing custom functionality
3. WP Migrate DB & WP Migrate DB Pro – for migrating WordPress websites from development to staging and production
4. WP All Import & WP All Import Pro – import CVS and XML files into WordPress