tamlyn

Unattach is a very simple plugin which allows detaching images and other media from WordPress posts, pages and other content types.
As of WordPress 4.2 this functionality is built in. For previous versions, the only way to detach a media item from a post is to delete either the post or the media item. This plugin solves that by adding an ‘Unattach’ link below each media file in the Media Library admin list view.
<a href="http://outlandish.com/blog/2011/03/unattach/" rel="nofollow ugc">Plugin by Outlandish</a>

Unattach

Allows detaching images and other media from posts, pages and other content types.

Daiv Mowbray

Soda pop for your media. Take control of your media. Access all size versions of your uploaded image for insert. SuperSlider-Media-Pop adds numerous image enhancements to your admin panels. Displays all attached files to this post/page in post listing screen. 
It adds image sizes to the Upload/Insert image screen, making all image sizes available to be inserted and adding to the image link field options. 
Insert any image size and link to any image size. 
Adds thumbnails and attachments list to your edit post / page list screens and edit screens. 
I recommend the plugin <a href="https://wordpress.org/extend/plugins/superslider-image/" title="SuperSlider-Image" rel="ugc">SuperSlider-Image</a> which makes a great campanion for SuperSlider-Media-Pop.
This plugin is designed for:
<ul>
<li>Screenshot lover – movie, game or anime review etc.</li>
<li>Howto guru – cooking guide, hardware DIY guide etc.</li>
<li>Photo logger – take control of your media.</li>
<li>Professionals who need more control over their media.</li>
</ul>
Features
<ul>
<li>Add thumbnails to your posts / page listing screen.</li>
<li>Add Attachments in this post to your posts / page listing screen.</li>
<li>Link your image to any sized pop over.</li>
<li>View available image sizes to link to and insert (with size information onscreen)</li>
<li>Insert any image size available for the active image. (WP 3.0+)</li>
<li>Access any plugin scaled image (which offer custom image size creation.)WP 2.9</li>
<li>Set the jpeg image quality of dynamically created image versions when uploaded with WordPress.</li>
<li>Define default user option for attachment link Url</li>
<li>Define default align option for image insert</li>
<li>Define user option for Default image size</li>
<li>Define post thumbnail size options for post / page listing screen</li>
<li>Adds column post ID to post / page listing screen.</li>
<li>Adds media attach – detach function to edit media screen.</li>
<li>Adds minithumb and links to attachment column in the edit post list.</li>
<li>Adds columns caption/description/alt-text/id to Media Library list page.</li>
<li>Adds metabox to post/page screen displaying all attached files to this post.</li>
</ul>
Demos
See screen shots of admin panels. This plugin can be seen in use here:
<ul>
<li><a href="http://superslider.daivmowbray.com/2010/superslider-media-pop-demo-1" title="Demo 1" rel="nofollow ugc">Demo 1</a></li>
</ul>
Acknowledgments
*The “change post attachment” feature is based on: Change Attachment Parent, by Joel Sholdice :<a href="http://lacquerhead.ca/2009/07/change-attachment-parent/" title="Change Attachment Parent" rel="nofollow ugc">Change Attachment Parent</a>
Support
If you have any problems or suggestions regarding this plugin <a href="https://wordpress.org/tags/superslider-media-pop" title="Superslider-Media-Pop at WordPress" rel="ugc">please speak up</a>
Other Plugins 
Download These SuperSlider Plugins here:
<ul>
<li><a href="https://wordpress.org/extend/plugins/superslider/" title="SuperSlider Base plugin, with numberous eye candy modules." rel="ugc">SuperSlider</a></li>
<li><a href="https://wordpress.org/extend/plugins/superslider-postsincat/" title="Superslider-PostsinCat" rel="ugc">Superslider-PostsinCat</a></li>
<li><a href="https://wordpress.org/extend/plugins/superslider-show/" title="SuperSlider-Show" rel="ugc">SuperSlider-Show</a></li>
<li><a href="https://wordpress.org/extend/plugins/superslider-image/" title="SuperSlider-Image" rel="ugc">SuperSlider-Image</a></li>
</ul>
NOTICE
<ul>
<li>The downloaded folder’s name should be superslider-media-pop</li>
</ul>
<h3>USAGE</h3>
If you are not sure how this plugin works you may want to read the following.
<ul>
<li>view plugin results on your image insert screen.</li>
<li>view plugin results on your post / page list screen.</li>
<li>view plugin added metabox on your post / page edit screen.</li>
</ul>
<h3>OPTIONS AND CONFIGURATIONS</h3>
<ul>
<li>set uploaded image compression level.</li>
<li>set thumbnail size for post list page.</li>
<li>set Default image links to.</li>
<li>set Default inserted image alignment.</li>
<li>set Default image size to insert.</li>
</ul>
<h3>To Do</h3>
<ul>
<li>Make your request</li>
</ul>
<h3>Report Bugs Request / Options / Functions</h3>
<ul>
<li>Please use the support system to the wordpress forums, <a href="https://wordpress.org/support/plugin/superslider-media-pop" title="Superslider-Media-Pop at WordPress" rel="ugc">please speak up</a>.</li>
</ul>

SuperSlider-Media-Pop

Take control of your media. Access all image sizes at the image insert and image link to field. See all attached images in your post listing page.

Unattach vs SuperSlider-Media-Pop