Philip Newcomer

There are plenty of plugins available which allow site visitors to rate posts, but I didn’t find any that gave the post author that functionality, so I wrote this plugin. Author Post Ratings adds a meta box to the post edit screen, allowing you to chose a 1-5 star rating for the post, or to leave it unrated. The plugin will automatically add the post rating (using stars, and an optional label) to the top or bottom of the post. If you wish, you can disable that functionality altogether and use a shortcode to insert the post rating anywhere in the post you choose. The plugin supports ratings for posts, pages, and custom post types, all of which can be individually enabled or disabled in the plugin settings. It is also fully internationalized, with Spanish language translation files included.
<h3>Translating the Plugin</h3>
The post rating label text can be changed in the plugin settings, so no translation is required for the frontend (public side) of the site. However, if you wish to translate the backend settings interface, the plugin is fully internationalized and ready for translation. There is a .po and a .mo file included in the plugin’s ‘languages’ directory for your convenience.
The plugin includes the following translations:
<ul>
<li>Spanish 
courtesy of <a href="http://www.webhostinghub.com/" rel="nofollow ugc">WebHostingHub</a>.</li>
</ul>

Author Post Ratings

Allows a post author to assign a simple 1-5 star rating to a post, page, or custom post type, which will then be displayed on the post.

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.

Author Post Ratings vs Universal Star Rating