hackadelic

When you use a shortcode in a text widget to dynamically create its content, the shortcode may yield empty content in some contexts, leaving you with an ugly looking empty widget in your sidebar with nothing more than a title and a blank rectange.
What you want is a text widget that will only show up when it does have content. This is such a widget.
A use case when you will immediately benefit from <a href="http://hackadelic.com/solutions/wordpress/discreet-text-widget" title="Discreet Text Widget" rel="nofollow ugc">Discreet Text Widget</a> is when you want a <a href="http://hackadelic.com/solutions/wordpress/toc-boxes" title="Hackadelic SEO Table Of Contents" rel="nofollow ugc">Table of Contents</a> <a href="http://hackadelic.com/table-of-contents-in-the-sidebar" title="How To Add a Table Of Contents to the Sidebar" rel="nofollow ugc">in the sidebar</a>.
Check out the <a href="http://hackadelic.com/solutions/wordpress/discreet-text-widget" title="Discreet Text Widget" rel="nofollow ugc">plug-in homepage</a> for in-depth information about the plug-in.
<h3>License</h3>
This file is part of the Hackadelic Discreet Text Widget WordPress plugin.
Hackadelic Discreet Text Widget is free software: you can redistribute it and/or modify it under the terms of the <a href="http://www.fsf.org/licensing/licenses/agpl-3.0.html" rel="nofollow ugc">GNU Affero General Public License</a> as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
Hackadelic Discreet Text Widget is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with Hackadelic Discreet Text Widget. If not, see <a href="http://www.gnu.org/licenses/" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

Hackadelic Discreet Text Widget

A smarter text widget that can be used to display table of contents in the sidebar.

ibnuyahya

This plugin allow you to display related post in the sidebar. It’s only appear when you open a single post. You can choose whether want to list all post or limit by number of posts.
<ul>
<li>Author: ibnuyahya</li>
<li>Author URI: <a href="http://www.ibnuyahya.com" title="developers note" rel="nofollow ugc">http://www.ibnuyahya.com</a></li>
<li>Copyright: Released under GNU GENERAL PUBLIC LICENSE</li>
</ul>

Hackadelic Discreet Text Widget vs Related post widget