pflonk

This plugin allows you to pass content to any sidebar from the page without using userdefined fields. Therefore it is possible to use the WYSIWIG-editor of your choice.
How it works: 
This plugin comes with a new enclosing shortcode [sidebar_content][/sidebar_content] where you can place any content, you want to have displayed in the sidebar. You will be able to use other shortcodes within this shortcode to use galleries, videos or any other stuff in the sidebar of your choice.
Additionally there will be a new widget which you can insert into the sidebar you want to have the content displayed. 
If you would like to pass content to an existing sidebar, there is another possibility using the [insert_sidebar_content] shortcode in any place you want. You are able to pass an id and/or a class to that content, to be able to style it with css as you like. This happens by simply adding: 
[insert_sidebar_content id=”yourID” class=”yourClass”] to the shortcode. You can of course use just one or none of them. If you do not specify any custom class or id, there will be a standard class and id called “insert_scfs” applied to the content, wrapped in a div.
<h3>Features</h3>
<ol>
<li>Widget</li>
</ol>
<ul>
<li>optional title (if empty, no tag will be generated)</li>
<li>optional title tag (default h3)</li>
<li>optional title tag CSS-classes</li>
<li>optional content-wrapper tag (default div)</li>
<li>optional CSS-classes for content-wrapper tag</li>
<li>optional CSS-id for content-wrapper tag</li>
<li>default values for every of the above possibilities</li>
</ul>
<ol>
<li>Shortcodes</li>
</ol>
2.1 Content-Enclosement
<ul>
<li>[sidebar_content]CONTENT[/sidebar_content] for use on any page</li>
</ul>
2.2 Widget-Display
<ul>
<li>[insert_sidebar_content id=”yourID” class=”yourClass”] to display the content from the [sidebar_content]-Shortcode in any widget you like</li>
<li>applicable id and classes</li>
</ul>
You will find further support on http://dev.offensichtlich.net
<h3>Thanks</h3>
Thanks to the authors that provided information about how to implement this simple little function that I just put together:
Ryan Bosinger 
http://www.ryanbosinger.com/boztown/2013/03/07/wordpress-custom-content/
1st-tec.de 
http://www.tipps.1st-tec.de/wordpress/39-wordpress/sidebar-widgets/152-eigene-widgets-fuer-die-sidebar-erstellen.html

Sidebar-Content from Shortcode

This Plugin enables passing content to any sidebar from the page without using userdefined fields. Therefore it is possible to use the WYSIWIG-editor  …

Thomas Maier

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Use Fixed Widget to create sticky widgets, sticky blocks, and other elements that stay in the visible screen area when a user scrolls the page up or down.
Sticky widgets are more visible than unfixed widgets and therefore have a significantly higher click-through rate.
That’s why this option is worthwhile for ads or other elements that visitors should interact with. Meanwhile, Google also allows the integration of <a href="https://wpadvancedads.com/google-adsense-sticky-ads/" rel="nofollow ugc">sticky AdSense ads</a>.
<ul>
<li><a href="https://wpadvancedads.com/fixed-widget-wordpress/" rel="nofollow ugc">Manual and demo</a></li>
</ul>
<h4>Features</h4>
Fixed Widget is completely free of charge.
<ul>
<li>Sticky Widgets Use the Fixed Widget option on any widget and blocks in the sidebar</li>
<li>Sticky Elements Choose any element on your site and make it sticky</li>
<li>Margin Top allows you to stop sticky elements to cover floating menu bars</li>
<li>Margin Bottom pushes sticky elements up before they reach a certain distance towards the bottom window</li>
<li>Stop Elements push sticky elements up when they are scrolling into view</li>
<li>Stop Blocks defines blocks in your sidebar that push fixed blocks out of the page</li>
<li>Minimum Screen Width and Minimum Screen Height allow you to disable sticky behavior on small screens</li>
<li>Written in plain JavaScript for better performance</li>
</ul>
<h4>Compatibility</h4>
Theme requirements:
<ul>
<li><code>wp_head()</code> and <code>wp_footer()</code> functions in <code>header.php</code> and <code>footer.php</code> files</li>
<li>JavaScript errors could break sticky widgets</li>
</ul>

Fixed Widget and Sticky Elements for WordPress

I have used this plugin on my website for the last 5+ years and it always worked very well. Updates were always stress free and never broke any layout. 

With version 6 I had some layout issues and Thomas helped me fix it. It's really hard to make a plugin compatible with the vast amount of themes out there and I would have totally understood if he didn't want to spend the time to fix my specific issue. But I was in for a pleasant surprise. 

I recommend this plugin and I wish him all the best. Thank you for your time and efforts. 

Kind regards,
Arun

Worked very well for the last 5+ years and impressive support

More attention and a higher ad performance with fixed sticky widgets.

Sidebar-Content from Shortcode vs Fixed Widget and Sticky Elements for WordPress