Link Footnotes is a tiny, simple WordPress plugin that will create a list of all the external links in your posts and pages and append it to the bottom of your page.
Once activated, there is no work required on your part. The plugin takes care of parsing any external links out of your content and adding them to the list.
Options
Default On – You can decide whether you want the plugin to display links by default. Either way you set this, it can be overridden on individual posts using a meta fields on your posts.
Heading – Allows you to set HTML displayed above your links. Default is <h2>Links</h2>
Meta Fields
If there is content in either of these meta fields then they’ll trigger. lf_off takes precedence over lf_on.
lf_on – Force the links to display, even if default is off
lf_off – Force the links not to display
Download
You can download the Link Footnotes plugin from the WordPress plugin library.