The Pronamic Domain Mapping plugin allows you to map domains to custom domain name pages.
Add page load times for admins on the front-end.
Adds dns prefetching meta tags to your site.
Provides visibility of Email setup & hooks used by other plugins, Outgoing connections exposing possible firewall problems, DNS setup and test fac
Manage a self hosted DNS from WordPress.
Plugin WP Clean removes meta-tags and disables unnecessary functions in CMS WordPress.
Widget-fixer fixes your widgets after you change to a new siteurl.