jellybooks

This is a plugin that simplifies the integration of the Jellybooks DISCOVERY service API, and embeds interactive book samples within product pages on a WordPress site:
<ol>
<li>It connects to the Jellybooks DISCOVERY API to retrieve book samples for a given ISBN.</li>
<li>It automatically adds interactive book samples to your book product pages via our excerpts.js library.</li>
</ol>
Note: For the avoidance of doubt, admins must have a valid Jellybooks DISCOVERY account and API key to use this plugin.
For further information about the API: https://www.jellybooks.com/apis/excerpts/index.html 
For further information about the excerpts.js library: https://www.jellybooks.com/apis/excerpt_integration/index.html. That page also explains some of the various options that are configurable in the plugin admin interface.
<h3>Source code</h3>
The plugin can be downloaded and its source code can be viewed and modified (as per Open Source license). The plugin also contains Jellybooks’ <a href="https://github.com/Jellybooks/excerpts-js" rel="nofollow ugc">excerpts.js library</a> in a minified form for improved performance.
A non-minified version is included within the assets directory. The full source code for the excerpts.js JavaScript and CSS files can be found in the <a href="https://github.com/Jellybooks/excerpts-js" rel="nofollow ugc"><code>excerpts.js</code> repository</a>.

Jellybooks DISCOVERY for Publishers

The Jellybooks DISCOVERY for Publishers plugin adds instant book samples to your book product pages.

Chasil

Universal Star Rating provides shortcodes to give the author the opportunity to add ratings/reviews for desired data, products and services with the aid of a classic star rating system. You can make use of these shortcodes to embed a single inline star rating or a tabular list of star ratings.
To insert a single inline star rating inside a post just type <code>[usr 5]</code> where 5 is the rating/amount of stars.
To insert a tabular list of star ratings inside a post just type <code>[usrlist "Pizza:3" "Ice Cream:3.5" (...)]</code> where the first value is what you want to rate and the second value is the rating/amount of stars. Your list should consist of more than 1 key:value pairs.
<h3>Translations</h3>
Note: This plugin is localized / translatable. This is very important for all users worldwide. So please contribute your language to the plugin to make it even more useful. See <a href="https://translate.wordpress.org/projects/wp-plugins/universal-star-rating" rel="nofollow ugc">Translations</a>

Universal Star Rating

USR provides shortcodes to give the author the opportunity to add ratings for desired products and services with the aid of a star rating system.

Jellybooks DISCOVERY for Publishers vs Universal Star Rating