pingback – The unofficial WordPress Plugin Directory

Pingcrawl

Pingcrawl adds a "Possibly related posts" capability by querying Google Blog Search for post tags and pinging the results.

SMu DoFollow has many DoFollow Options (Manual or Automatism) and included URL Validator (Manual, WP-Cron or Cronjob).

Easily customize WordPress notification emails.

One step process to remove pingbacks and trackbacks and leave only real user opinions in your posts comments.

Auto-Close keeps your site clean by automatically closing comments, pingbacks, and trackbacks—so you can focus on content, not cleanup.

Prevents trackbacks and pingbacks from showing up as comments on posts.

Stops a WordPress blog from pinging itself with pingbacks

This plugin disables the WordPress XMLRPC pingback ping.

Enable conversation across the web.

Prevent pingback, XML-RPC and denial of service DDOS attacks by disabling the XML-RPC pingback functionality.