f13dev

Generate a table of contents based on header tags within the post. Outputs an indented list of anchor links at the top of each page or post linking to the relevant header tag.
Tabe of Contents does not require any configuration. On page or post loading, the content is examined for header tags that can be used to generate a ToC. If the header tag does not have an ID attribute one will be added for the purposes of linking, otherwise the existing ID tag will be used.
<a href="https://f13.dev/wordpress-plugin-table-of-contents/" rel="nofollow ugc">Read more about F13-TOC</a>

F13 Table of Contents

Add a Table of Contents with internal anchor links, built automatically from header tags.

Tobias Nyholm

This plugin puts a table of contents on your page. You just need to type <code>[toc levels=3 title="Table of contents"]</code> in the page/post editor. That’s it! 
You dont need to edit your themes source code. The plugin allows you to set a title of the toc box. You can also choose which heading tags (h1,h2,h3,h4 etc) 
you want to have in the table of contents. For more information see installation page or the 
<a href="http://www.webfish.se/wp/plugins/seo-friendly-table-of-contents" title="Webfish - WordPress plugin" rel="nofollow ugc">Webfish</a> homepage.

Seo Friendly Table of Contents

A simple seo friendly table of contents plugin that does not require editing in your themes source code.

F13 Table of Contents vs Seo Friendly Table of Contents