Janar

One post widget

Show recent post in widget area so the widget title/content itself is given post title and contents. You can choose queue which post to show from recent posts or just give specific ID.

Thomas Maier

Advanced Ads

Max Bond

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.

One post widget vs Fixed Widget and Sticky Elements for WordPress