Remove XML-RPC Pingback
Stop XML-RPC Attacks
WP Exchange Link
SmileBox Widget
WP Custom Emails
Eazy XMLRPC Pingback Disable
Remove Pingback-Trackback Comments
Pingcrawl
External Related Posts
Deep Link Engine
Follow Self Pings
Elsewhere
Pingchecker
BM-TrackPing
Talkback
Feedback
Stop Pinging Yourself
Webmention
Kramer
Force Ping Display With Disqus
YARPP Experiments
Disable XML-RPC Pingback
Auto-Close Comments, Pingbacks And Track...
WP-Hashcash Extended
Hide Trackbacks
SMu Manual DoFollow
WP-Hashcash
Greg's Threaded Comment Numbering