Mariapan

This plugin allows you to add a tag/category cloud with count widget to your sidebar or use a shortcode to show a category/tag cloud with count in post & page. You can select color combination of cloud, the minimum number of posts in a category to show and which categories to include or exclude.
<h4>Features</h4>
<ul>
<li>Use as a widget or shortcode</li>
<li>Configurable color combination of your cloud display</li>
<li>Order by number of posts in each category or alphabetically</li>
<li>Specify the minimum number of posts that a category has to have before it shows</li>
<li>Specify categories to include or exclude, or use them all</li>
</ul>
<h4>Usage</h4>
Shortcode 
Optionally enter [tagmagic] in a page or post to show the category cloud. See the FAQ for examples.
Title 
This is the usual widget title that will appear in your theme’s sidebar.
Order by
Choose between ordering by number of posts in a category, or alphabetically by category name.
Show by 
Either the category with the most posts first or the category with the fewest posts first if using Order by: count, or A-Z or Z-A if Order by: name.
Minimum number of posts 
Categories where the total number of posts is less than this number will not be shown. Set to 1 to hide empty categories.
Comma separated category IDs 
If you only want to include specific categories, enter their IDs in a list. If you want to exclude a category, enter its ID as a negative number. Leave blank for all categories.
<ul>
<li>
Example: 1,10,20 
This will create a category cloud with only categories 1,10,20 in it.
</li>
<li>
Example: -1,-3 
This will create a category cloud hiding categories 1 and 3.
</li>
</ul>
Parent category ID 
If you only want to include categories cloud of particular parent category, enter their IDs in a list. Leave blank for all categories.
<ul>
<li>Example: 1 
This will create a category cloud of parent category 1.</li>
</ul>

Wp Tag Magic Widget

Display selected tags or categories as a tag cloud using a sidebar widget or shortcode.

liquidwebdan

Newer Tag Cloud is a WordPress plugin that generates a tag clouds. This plugin was inspired by the original New Tag Cloud.
Newer Tag Cloud uses the WordPress own tagging feature, so that you don’t need any tagging plugin. You can use New Tag Cloud directly as a shortcode in any post/page, as a widget, or in the theme as PHP code. Use it however you’d like, it’s flexible!
The original New Tag Cloud had been without updates for 7 years this caused issues with modern WordPress versions. Due to the issues, for a short time, a privately updated version was created at Liquid Web. Now this small fix has been turned into a complete code refactor. The results are now being released to the community!
Configurebale options 
* widget box title 
* how many tags should be shown 
* biggest font size 
* smallest font size 
* font size stepping 
* font size type (px, em, rem, etc) 
* filtering 
* caching

Newer Tag Cloud

A small plugin providing a neat tag cloud feature. Inspired by New Tag Cloud.

Wp Tag Magic Widget vs Newer Tag Cloud