Martin

This simple plugin allows you to create tables without any knowledge of HTML. It supports different column types, like images, plain text and buttons.
Its initially function was a simple comparison table manager, but it can be used for other purposes as well.
If you like this plugin, please rate it or make a <a href="http://vandebelt.dk/donate/" title="Donate" rel="nofollow ugc">donation</a> to ensure future updates!
A few notable features:
<ul>
<li>Create tables easily without HTML knowledge.</li>
<li>Different column types. Images, text and buttons.</li>
<li>Styles included.</li>
<li>A high amount of different CSS-classes. Makes it easy to create a custom table design.</li>
</ul>
Please let me know if you encounter bugs or have comments/ideas for further development of this awesome plugin.

WP Compare Tables

Another simple table plugin. It helps you to easily create tables with custom column types. Mainly used to compare products against each other.

Miaz Akemapa

Komper is a plugin to create side-by-side product comparison. With this plugin, you can create product specifications, add products information, and display the comparison form widget to the front page. 
In front page, user may search the product to compare via comparison form widget with autocomplete feature. 
The result will be displayed in table chart.
Komper Features:
<ul>
<li>Create product specifications fields dynamically</li>
<li>Drag and drop fields to change the order of the fields</li>
<li>Widget supported</li>
<li>Search product with autocomplete features</li>
<li>Display side-by-side product comparison in table chart</li>
</ul>
Coming Soon
<ul>
<li>More Field type</li>
<li>New table layout</li>
<li>Customizeable css table</li>
</ul>
Please note this is the free version. 
In this free version, you can create up to 15 fields and display 2 products to compare.
Upgrade to Pro version, and get more features:
<ul>
<li>Unlimited product specification fields</li>
<li>Unlimited product to compare</li>
<li>Shortcode supported, Insert product comparison table and comparison form in any posts or pages.</li>
<li>Full Support</li>
</ul>
Get Pro version here: 
<a href="http://www.vnetware.com/" rel="nofollow ugc">http://www.vnetware.com/</a>
Try Demo: 
<a href="http://demo.vnetware.com/komper/" rel="nofollow ugc">http://demo.vnetware.com/komper</a>
Note 
You can try public release version here: 
http://src.vnetware.com/komper/pub/
This release include quick fixes, new features, and other workaround.

Komper

A plugin to create side-by-side product comparison table.

WP Compare Tables vs Komper