Andreas Hecht

Creates a new and simple to use widget that adds a tabbed sidebar box with recent posts, last comments, categories, popular posts, a tag cloud and the archives to the sidebar. No Options. This widget is perfect for light-colored themes.
To use the widget, go to Appearance -> Widgets and add “AH Sidebar Box” widget.

AH Sidebar Box

This widget adds a tabbed sidebar box with recent posts, last comments, categories, popular posts, a tag cloud and the archives to the sidebar.

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.

AH Sidebar Box vs Cool Tag Cloud