WordPress.org

Ella

This plugin allows you to create documents with WordPress, and to share them with others so they can also read and edit. Share the unique link to let anyone edit, or restrict access to specific email addresses.
With the Gutenberg plugin, Docs supports real-time collaborative editing — multiple users can edit the same document simultaneously, seeing each other’s cursors and changes live.
<h3>Sharing</h3>
The share panel (in the document sidebar) lets you control access:
<ul>
<li>Anyone with the link — anonymous users get a randomly generated animal name and emoji avatar (e.g. “Anonymous Fox”). They can edit text but cannot upload files.</li>
<li>Specific people — invite collaborators by email. They receive a magic link to access the editor. Email-invited users can upload files.</li>
<li>Existing users — add collaborators from the user autocomplete. They get full editing and upload access.</li>
<li>Restricted — only the document author and invited people can access.</li>
</ul>
<h3>How it works</h3>
Documents live entirely in wp-admin — there’s no public frontend. Each doc gets a unique and secret shareable URL that opens the editor directly.
Anonymous visitors don’t create any database entries. Their identity exists only in a browser cookie and disappears when it expires.
Email-invited people are created as real WordPress users (without a role) so their edits show up in revision history. They log in via magic links sent to their email.

Docs

how it works? 
Can I use it in the classic editor?

how it works

Create and share documents with WordPress!

Eero Hermlin

Native, lightweight, super-fast plugin for updating comments in real-time with Ajax, without need to refresh the page. Allows comments section work interactively like a chatroom. Comments re-classified as trash or spam will be dynamically removed from users screen. It’s pure WordPress plugin, no need for third parties (like Disqus), no paid services, no secondary logins. Perfect alternative to Disqus.
Administrator can choose update frequency, define in what pages realtime comments are used, comments ordering in selected pages. Additionally is possible to set custom walker function (if used theme uses it) and size of avatar.
Supports also paginated view of comments: in this case new top-level comments will be dynamically are added to newest comments page. Nested comments will be dynamically added to parent comments at any comments page.

Realtime Comments

Accepted comments from users are added to pages in real-time, without need to refresh. Makes comments section work interactively, like a chatroom.

Docs vs Realtime Comments