Helen Hou-Sandi

<p>Really Simple Gallery Widget adds a widget to display images from the Media Library, no extra uploading or creating custom post types required. You can choose to show images from a specific post/page, the entire media library, or a specific set of attachment IDs. On single pages/posts, you can also show only images attached to the item currently being viewed. Especially helpful if your galleries are based on what’s attached to a post and you want to be able to easily display those images in a widget area.</p>
<h4>Features</h4>
<ul>
<li>Add as many widgets as you want, wherever you want</li>
<li>Display images from a specific post/page, the entire Media Library, or a specific set of attachment IDs</li>
<li>Display images from the post/page currently being viewed</li>
<li>Select a number of images</li>
<li>Select any registered size in WordPress</li>
<li>Display the images in various orders</li>
<li>Show or hide captions</li>
<li>Link the images to the original file, post, anchor in the post, attachment page, or nothing. NOTE: If the image is not attached to a post, the file link will be used instead of the post or anchor in the post.</li>
<li>Add a prefix to the link and image title (appears as a tooltip)</li>
<li>Use a rel attribute for the link – great for lightboxes</li>
</ul>


Really Simple Gallery Widget

Simple widget for displaying images from the Media Library with plenty of configurable options.

Eric Mann

<p>Gives you the option of adding a Javascript-powered fading image gallery as a sidebar widget.  The widget pulls its images from previous posts and automatically re-sizes them for display in the appropriate area.</p>


Rotating Image Widget

Create a jQuery-driven rotating image sidebar widget.

Really Simple Gallery Widget vs Rotating Image Widget