Arefly

Colorful Your Blog’s Tag Cloud.
為你部落格的標籤雲加上色彩
Live Demo: <a href="http://www.arefly.com/" rel="nofollow ugc">Click Here</a> (See My Tag Cloud Widget)
<h4>Translators</h4>
<ul>
<li>Chinese, Simplified (zh_CN) – <a href="http://www.arefly.com/" rel="nofollow ugc">Arefly</a></li>
<li>Chinese, Traditional (zh_TW) – <a href="http://www.arefly.com" rel="nofollow ugc">Arefly</a></li>
<li>English (en_US) – <a href="http://www.arefly.com" rel="nofollow ugc">Arefly</a></li>
</ul>
If you have created your own language pack, or have an update of an existing one, you can send <a href="https://codex.wordpress.org/Translating_WordPress" rel="nofollow ugc">gettext PO and MO files</a> to <a href="http://www.arefly.com/about/" rel="nofollow ugc">Arefly</a> so that I can bundle it into Colorful Tag Cloud. You can download the latest <a href="https://plugins.svn.wordpress.org/colorful-tag-cloud/trunk/lang/colorful-tag-cloud.pot" rel="nofollow ugc">POT file</a>.

Colorful Tag Cloud

Colorful Your Blog's Tag Cloud. 為你部落格的標籤雲加上色彩

Waterloo Plugins

Tag Cloud Widget adds a simple tag cloud widget that you can use anywhere on your blog. This plugin looks at all your tags and displays them in a widget. The more times a tag is used, the larger the tag is.
Each tag is a link to the tag page (e.g. http://your-site.com/tag/your-tag). This will help with SEO.
Currently, there aren’t any options to customize the tag cloud. It should work well out of the box. In the future, there may be options to customize the widget.

Good

A tag cloud widget with links to your tag pages

Colorful Tag Cloud vs Tag Cloud Widget