The Krotek

Customizable widget and shortcode to display tag cloud anywhere you want. You can use it as standard tag cloud widget, as shortcode in any post or page, or both ways. Tons of options allow you to fine tune cloud layout to your needs.
STANDARD FEATURES
<ul>
<li>Display list of post, category or link category tags.</li>
<li>Define number of tags to be displayed.</li>
<li>Set custom tag separator.</li>
<li>Select tag taxonomy: posts, categories or link categories.</li>
<li>Choose cloud mode: shortcode only, widget only or both.</li>
</ul>
PREMIUM FEATURES
<ul>
<li>Define smallest and largest tag size.</li>
<li>Select size unit: px, pt, em or percent.</li>
<li>Choose layout: standard flat cloud or unordered list.</li>
<li>Order tags by name or count.</li>
<li>Sort tags ascending, descending or randomize.</li>
<li>Define list of tags to exclude from cloud or include only.</li>
</ul>
You can purchase Premium version <a href="https://thekrotek.com/wordpress-extensions/tag-cloud" rel="nofollow ugc">here</a>.

Custom Tag Cloud

...but it at least is a little better than the one that comes with WordPress.

Free version is not very customizable...

Customizable widget and shortcode to display tag cloud anywhere you want.

keith_wp

The normal WP Tag Cloud widget only uses one taxonomy at a time, and doesn’t handle the default post_tag or category taxonomies being assigned to custom post types.
With this plugin, you can now configure (on a per-widget basis):
<ul>
<li>which taxonomies and post types are to be included,</li>
<li>the size of the smallest and largest tags (in different font units),</li>
<li>which terms should always be excluded from the cloud,</li>
<li>the maximum number of tags to show in the cloud,</li>
<li>how to order the tags – alphabetically or by number of tagged posts (ascending or descending), or just randomly,</li>
<li>how to treat tags with just one entry – leave alone, remove them or link directly to that post,</li>
<li>whether to make links no-follow,</li>
<li>what case the tags should appear as,</li>
<li>the widget background and tag background/foreground colours,</li>
<li>and how long each widget’s output should be saved for, if at all.</li>
</ul>

Combined Taxonomies Tag Cloud

A widget to make tag clouds out of multiple taxonomies, across multiple post types and control their appearance.

Custom Tag Cloud vs Combined Taxonomies Tag Cloud