Letícia Moreira

Darven – Who Published ensures editorial integrity by saving and displaying the original author who published a WordPress post or page. Even if a post is edited later by other users, the plugin preserves the original publisher information and displays it in the admin interface.
Features include:
<ol>
<li>A new column “Who Published” in post and page listings.</li>
<li>A visual badge system to highlight confirmed and guessed authors.</li>
<li>A metabox in the post editor showing the original author.</li>
<li>Admin filtering by original publisher.</li>
<li>REST API compatibility.</li>
<li>Translations included: pt_BR, pt_PT, es_ES.</li>
</ol>

Darven – Who Published

Preserves and displays the original user who published a post, even after edits or updates.

Mervin Praison

This plugin helps you add Google authorship markup to your WordPress site, allowing your Google Plus profile picture to appear in Google Search results.
Features: 
* Easy 4-step setup process 
* Multiple author support 
* Multisite compatible 
* Shortcode support

WP Google Authorship

Nice

Google Plus Profile Picture appear in Google Search. Very Easy to implement. Including Google authorship for multiple authors and multisite.

Darven – Who Published vs WP Google Authorship