Ryan Kienstra

<ul>
<li>Requires <a href="https://getbootstrap.com/" rel="nofollow ugc">Bootstrap</a> 3.2 or later</li>
<li>This responsive widget resizes with its container</li>
<li>With the <a href="https://make.wordpress.org/core/2017/05/26/media-widgets-for-images-video-and-audio/" rel="nofollow ugc">Video widget</a> in WordPress 4.8 and later, this widget is less necessary for videos</li>
<li>Though this widget still works with videos, the <a href="https://make.wordpress.org/core/2017/05/26/media-widgets-for-images-video-and-audio/" rel="nofollow ugc">Video widget</a> displays well in many <a href="https://getbootstrap.com/" rel="nofollow ugc">Bootstrap</a> themes</li>
<li>But this widget also supports embeds like <a href="https://www.slideshare.net" rel="nofollow ugc">SlideShare</a>, <a href="https://speakerdeck.com" rel="nofollow ugc">Speaker Deck</a>, <a href="https://spotify.com" rel="nofollow ugc">Spotify</a>, and <a href="https://soundcloud.com" rel="nofollow ugc">SoundCloud</a></li>
</ul>
<iframe loading="lazy" class="youtube-player" width="640" height="360" src="https://www.youtube.com/embed/6FfXmebV1sI?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>

Adapter Responsive Video

A widget for videos and embeds from YouTube, SlideShare, Spotify, and more. Resizes to its container.

Andrew Rockwell

This plugin automatically makes all the tables on your site responsive.
Live Example: 
http://plugins.rockwellgrowth.com/automatic-responsive-tables/
NEW!
<ul>
<li>exclude option</li>
<li>applies to dynamically loaded tables now</li>
</ul>
Features:
<ul>
<li>Fixed bug with links in the table</li>
<li>Fixed bug for tables with no table headers</li>
<li>Specify only certain tables you’d like this plugin to affect.</li>
<li>Specify the breakpoint for responsiveness</li>
<li>Optional styling</li>
<li>Compatible across all major browsers</li>
<li>Backend style editor w/ preview panel</li>
<li>Supports IE5+ !!!</li>
</ul>

Automatic Responsive Tables

Just tested this with a Donation Confirmation Receipt from our Give plugin and it works perfectly without having to configure anything. 
I don't know what it would do with really complex tables, but for the basics this does the job.
Nice work!



Works right out of the box

Leave your tables as they are. Add this plugin, and they're all responsive.

Adapter Responsive Video vs Automatic Responsive Tables