Pingcrawl aims to replicate WordPress.com’s “Possibly related posts” capability. It queries Google Blog Search for related blog posts (based on tags, or the post title if there are no tags), tries to verify that they are pingback/trackback compatible sites and, if so, adds links to such posts to the end of each blog post where it is invoked.
Scope-limiting configuration options are included to enable Pingcrawl to fit any WordPress installation’s memory/execution time budget.
Licence
Pingcrawl is free software released under the GPL. If you find it valuable, you’re invited to make a small donation toward its ongoing support and maintenance.
This plugin is available for download to be used on your WordPress self-hosted installation.