Andreas Norman

This widget that displays an archive for the current selected category. On non-category pages a standard archive is displayed.
<ul>
<li>On a post page the widget will only display an archive for posts in that category</li>
<li>On a category listing the widget will only display an archive for posts in that category</li>
<li>On the front page or in a search result or any other page that doesn’t reside in a category a standard archive will be displayed.</li>
</ul>

Subzane Categorized Archive Widget

A widget that displays an archive for the current selected category. On non-category pages a standard archive is displayed.

sarah semark

Nix Prefix is a super-simple WordPress plugin to remove or customise the prefix text on your archive pages. Go from:
<blockquote>
Category: Puppies and Kittens
</blockquote>
to
<blockquote>
Puppies and Kittens
</blockquote>
on your archive pages—no child themes required!
For a better visual of what this does, have a look at the screenshots tab.
<h4>Need help?</h4>
<ul>
<li>Full documentation: http://sarahmonster.github.io/nix-prefix/</li>
<li>Github repo: https://github.com/sarahmonster/nix-prefix</li>
<li>Ask me on Twitter: https://twitter.com/sarahsemark</li>
</ul>

Nix Prefix

A super-simple plugin to remove the "Category:" prefix text on archive page titles.

Subzane Categorized Archive Widget vs Nix Prefix