stratosg

Writing a post with footnotes has never been easier and cleaner before. All you need to do is anchor a footnote at any point and then write it on the end of the paragraph or wherever it fits you.
Usage
To anchor a footnote use the {{FOOTNOTE_NUMBER}}. Then to write the body of it you need to embrace it with [[FOOTNOTE_NUMBER]]. Here is an example:
—— document starts here ——- 
Lorem ipsum dolor sit amet, con sectetuer adipiscing elit, sed diam 
tempor incidunt ut labore et dolore magna ali quarn erat volupat.{{1}} 
venian, quis nostrud exerci tation ullamcorper{{2}} suscipit laboris 
commodo consequat. Duis autem vel eum irure dolore
[[1]]This is the first footnote.[[1]] 
[[2]]This is the second footnote.[[2]]
This is the next paragraph. Lorem ipsum dolor sit amet, con sectetuer 
adipiscing elit, sed diam nonnumy nibh euismod tempor incidunt ut 
labore et dolore magna ali quarn erat volupat. Ut wisi enim ad minim. 
—— document ends here ———
When the document is parsed, the footnotes that are between paragraphs will be removed from where they are and placed at the end of the document. The {{1}} will be replaced with an anchor link to the footnote. The footnotes will be a list having and anchor link back to the place the text has it. Here is what roughly the above text will look like after parsing:
—— document starts here ——- 
Lorem ipsum dolor sit amet, con sectetuer adipiscing elit, sed diam 
tempor incidunt ut labore et dolore magna ali quarn erat volupat.[1] 
venian, quis nostrud exerci tation ullamcorper[2] suscipit laboris 
commodo consequat. Duis autem vel eum irure dolore
This is the next paragraph. Lorem ipsum dolor sit amet, con sectetuer 
adipiscing elit, sed diam nonnumy nibh euismod tempor incidunt ut 
labore et dolore magna ali quarn erat volupat. Ut wisi enim ad minim.
FOOTNOTES 
1. This is the first footnote. 
2. This is the second footnote. 
—— document ends here ———
The up arrows and the [1] and [2] are the links. There are a few options that you can tweak, for now it’s in the code. Please refer to the plugin’s homepage at: http://www.stratos.me/wp-plugins/yafootnotes
<h3>Requirements</h3>
None what so ever…
<h3>Credits</h3>
Mr. Mike Nichols from http://anxietypanichealth.com/ inspired me, motivated me and helped me debug.
<h3>Contact</h3>
Suggestion, fixes, rants, congratulations, gifts etc to stratosg@stratosector.net 
Also visit the plugin’s page at http://www.stratos.me/wp-plugins/yafootnotes/

YAFootnotes

Yet Another Footnotes (YAFootnotes) is a plugin that gives you the ability to add footnotes to any text you are writing.

Weston Ruter

David Artiss

Milind More

Erica

Mark Cheret

Felipe Lavín

P.E.A. Lutz

meglio

Stefan Herndler

martinneumannat

derivationfr

vonpiernik

Aharon

Rumperuu

MatKus

Lol Zimmerli

pewgeuges

Jimmy Thai

footnotes aims to be the all-in-one solution for displaying an automatically-generated list of references on your Page or Post. The Plugin ships with a set of defaults while also empowering you to control how your footnotes are being displayed.
footnotes gives you the ability to display well-formatted footnotes on your WordPress Pages and Posts, as well as in post excerpts with fully functional tooltips if enabled.
Featured on <a href="http://premium.wpmudev.org/blog/12-surprisingly-useful-wordpress-plugins-you-dont-know-about/" rel="nofollow ugc">wpmudev</a> – cheers for the review, folks!
<iframe loading="lazy" class="youtube-player" width="640" height="360" src="https://www.youtube.com/embed/HzHaMAAJwbI?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation"></iframe>
<h4>Main Features</h4>
<ul>
<li>Fully-customizable footnote start and end shortcodes;</li>
<li>styled hyperlink tooltips;</li>
<li>responsive reference container with customisable position;</li>
<li>ability to display reference container inside a widget;</li>
<li>wide choice of numbering styles;</li>
<li>freely-configurable optional backlink symbol;</li>
<li>configurable footnote appearance; and</li>
<li>shortcodes button in Post editor.</li>
</ul>
<h3>Usage</h3>
These are a few examples of possible ways to delimit your footnotes:
<ol>
<li>Your awesome text((with an awesome footnote))</li>
<li>Your awesome text[ref]with an awesome footnote[/ref]</li>
<li>Your awesome text<fn&rt;with an awesome footnote</fn></li>
<li>Your awesome text<code>custom-start-shortcode</code>with an awesome footnote<code>custom-end-shortcode</code></li>
</ol>
<h3>Support</h3>
Please report feature requests, bugs and other support related questions in the <a href="https://wordpress.org/support/plugin/footnotes">WordPress Support Forum</a>.
Speak your mind, unload your burden, bring it up, and feel free to <a href="https://wordpress.org/support/plugin/footnotes/reviews/">post your rating and review!</a>.

footnotes

footnotes lets you easily add highly-customisable footnotes on your WordPress Pages and Posts.

YAFootnotes vs footnotes