JReferences
This plugin adds references and citations functionalities (in a wikipedia-like style).
Plugin Tag: footnotes
Advanced Footnotes
Advanced Footnotes lets you add footnotes on articles via shortcodes.
WP-Footnotes to YAFootnotes
Automatically changes footnote syntax from WP-Footnotes to YAFootnotes Plugin.
Footnote Drawer
Footnote Drawer displays footnotes in the drawer UI.
Icon Footnote
Gutemberg block that adds beautiful footnotes using material icons..
MNML Footnotes
Simple auto-listed footnotes for posts.