ATOI

The main goal we wanted to achieve by writing this plugin was delicate tags appearance tweaking. Now plugin supports tag color and size tweaking, pretty urls, automatic and manual tags and tag cloud output, tag preview and tagged posts count. Such features as tag aliases and search by tag are planned to be implemented in next release.
We are glad to introduce this plugin to the community. If you think that it is necessary and there is need in developing it further, we will do it.
Bug reports and feature requests are welcome.
<h3>Example</h3>
There are 100 posts with tags as your site. 
There are four tags defined: tag1, tag2, tag3, tag4. 
Tag1 has 10 posts, tag2 has 40 posts, tag3 has 20 posts, tag4 has 70 posts (post can have more than one tag). 
There are 3 colors (color1, color2, color3) and 2 sizes defined (10px, 30px). 
So there are 3 color categories and 2 size categories. 
If a tag has less than 33% of tagged posts, it gets into 1st color category. 
If it has more than 33% and less than 66% of tagged posts, in gets into 2nd color category. 
If it has more than 66% of tagged posts, it gets into 3rd color category. 
The same thing with colors. 
So: 
tag1 – 10 posts (10%); color:color1; size:10px; 
tag2 – 40 posts (40%); color:color2; size:10px; 
tag3 – 20 posts (20%); color:color1; size:10px; 
tag4 – 70 posts (70%); color:color3; size:30px;

Xata33 Tag

The main goal we wanted to achieve by writing this plugin was delicate tags appearance tweaking

WPKube

The plugin renders a tag cloud using a professionally designed tag image as a background.
The plugin’s tag cloud is completely responsive and is correctly rendered in all browsers.
The primary application of this feature is through the “Cool Tag Cloud” widget, but you can also use the shortcode [cool_tag_cloud] to display the tag cloud anywhere where shortcodes are supported.
Here is the list of parameters that can be used with the shortcode, each with its own set of potential values (which are separated by the | symbol):
<ul>
<li><code>style="default|silver|green|red|blue|brown|purple|cyan|lime|black"</code></li>
<li><code>font_family="Arial, Helvetica, sans-serif"</code></li>
<li><code>smallest="10"</code></li>
<li><code>largest="10"</code></li>
<li><code>align="left|right"</code></li>
<li><code>font_weight="normal|bold"</code></li>
<li><code>text_transform="none|uppercase|lowercase|capitalize"</code></li>
<li><code>number="20"</code></li>
<li><code>order_by="name|count"</code></li>
<li><code>order="ASC|DESC|RAND"</code></li>
<li><code>taxonomy="post_tag"</code></li>
<li><code>nofollow="yes|no"</code></li>
<li><code>animation="yes|no"</code></li>
<li><code>on_single_display="global|local"</code></li>
<li><code>on_archive_display="all|children|siblings|descendants"</code></li>
<li><code>exclude="1,2,3"</code></li>
<li><code>include="1,2,3"</code></li>
</ul>
If you liked my plugin, please rate it.
Special thanks to <a href="http://www.premiumpixels.com/freebies/tagtastic-tag-cloud-psd/" rel="nofollow ugc">Orman Clark</a> for the tag image and to <a href="http://dimox.name/beautiful-tags-markup/" rel="nofollow ugc">Dimox</a> for the CSS code.
This plugin is maintained by <a href="https://www.wpkube.com" rel="nofollow ugc">WPKube</a>, a WordPress resource site where you can find helpful guides like how to <a href="https://www.wpkube.com/list-building-wordpress-plugins/" rel="nofollow ugc">choose the right list building plugin</a>, <a href="https://www.wpkube.com/install-wordpress" rel="nofollow ugc">how to install WordPress</a>, <a href="https://www.wpkube.com/best-wordpress-hosting/" rel="nofollow ugc">choose the best WordPress hosting</a>, and more. 
They also have a huge collection of <a href="https://www.wpkube.com/coupons/" rel="nofollow ugc">exclusive deals</a> on various plugins and hosting services such as <a href="https://www.wpkube.com/coupons/wpengine-coupon/" rel="nofollow ugc">WPEngine</a>, <a href="https://www.wpkube.com/coupons/siteground-coupon/" rel="nofollow ugc">SiteGround</a>, etc.

Cool Tag Cloud

This came as a blessing when I had written some custom code to show a custom Taxonomy cloud on sidebar. The options to customize are so cool, and I love the option to either show the taxonomy related to a post on a Single post page or all tags, that makes it so versatile. Thanks so much to the author.

Xata33 Tag vs Cool Tag Cloud