maff

The NextGEN widgets only allow showing of single images, I needed a solution to show links to galleries, so I wrote this widget. You can specify the following parameters:
<ul>
<li>Maximum Galleries: the number of galleries you want to show</li>
<li>Gallery Order: you can select random, date added ascending or date added descending</li>
<li>Gallery Thumbnail: which image should be taken as thumbail in the sidebar (preview set in NGG, first or random image)</li>
<li>AutoThumb parameters: if you got <a href="https://wordpress.org/extend/plugins/autothumb/" rel="ugc">AutoThumb</a> installed, the widget will use its functions to resize the image to your needs. Use a string like <code>w=80&h=80&zc=1</code> here to show 80×80 square thumbnails.</li>
<li>Output width/height: if you don’t use AutoThumb, the plugin will set the HTML attributes width & height.</li>
<li>Default Link Id: the widget assumes that you set up pages for each gallery and link the gallery to that page (you can use the NGG Gallery Editor to do this). If a gallery has no link set, it will use the default link (id of a page or post).</li>
<li>Exclude galleries: exclude galleries by specifying their ID as comma separated list</li>
</ul>
All development is done on <a href="https://github.com/maff/wp-nextgen-gallery-sidebar-widget" rel="nofollow ugc">GitHub</a>. If you have ideas, enhancements, etc. feel free to fork the project and send a pull request.
For any issues please use the <a href="https://github.com/maff/wp-nextgen-gallery-sidebar-widget/issues" rel="nofollow ugc">Issue Tracker</a>.
Templating:
Beginning with version 0.3, you have full control over the widget’s output as it is controlled with templates. As the built-in templates would get overwritten on every plugin update, create a new directory called “ngg-sidebar-widget” in your theme’s directory and copy the two template files “tpl.outer.html” and “tpl.inner.html” over there to edit them. The outer template is just a wrapper template (useful when you need some additional markup, e.g. when creating a list), the inner template has access to all the values from the gallery and image object (written in a simple templating syntax: {=object.member}). For the most use cases you should only need “gallery.title”, “gallery.link” and “image.url”.
You will have access to the following variables:
<ul>
<li>gallery
<ul>
<li>gid</li>
<li>name</li>
<li>path</li>
<li>title</li>
<li>galdesc</li>
<li>pageid</li>
<li>previewpic</li>
<li>author</li>
<li>link</li>
</ul>
</li>
<li>image
<ul>
<li>errmsg</li>
<li>error</li>
<li>imageURL</li>
<li>thumbURL</li>
<li>imagePath</li>
<li>thumbPath</li>
<li>href</li>
<li>thumbPrefix</li>
<li>thumbFolder</li>
<li>galleryid</li>
<li>pid</li>
<li>filename</li>
<li>description</li>
<li>alttext</li>
<li>imagedate</li>
<li>exclude</li>
<li>thumbcode</li>
<li>name</li>
<li>path</li>
<li>title</li>
<li>pageid</li>
<li>previewpic</li>
<li>permalink</li>
<li>post_id</li>
<li>sortorder</li>
<li>meta_data</li>
<li>gid</li>
<li>galdesc</li>
<li>author</li>
<li>imageHTML</li>
<li>thumbHTML</li>
<li>url</li>
<li>output_width</li>
<li>output_height</li>
<li>output_width_tag</li>
<li>output_height_tag</li>
</ul>
</li>
</ul>

NextGEN Gallery Sidebar Widget

A widget to show NextGEN galleries in your sidebar.

jjcoder

The ‘JJ NextGen List’ allows you to create an image list as a widget or as a shortcode. 
This plugin uses the ‘NextGen Gallery’ plugin for its images.
Requirements:
<ul>
<li>NextGen Gallery Plugin (https://wordpress.org/extend/plugins/nextgen-gallery/)</li>
</ul>
NextGen Gallery Integration:
<ul>
<li>This plugin uses the original width and height of the image uploaded so make sure the images are the correct dimensions when uploaded.</li>
<li>If a width and height are defined under the configuration all images will be resized to those dimensions=.</li>
<li>Alt & Title Text Field: Provide a full url here and the image will link to this. Only works if alt field starts with either of these; /, http, or ftp.</li>
<li>Description Field: Will be used as image alt text. If alt text is present but not a valid url alt text will be used instead for image alt text.</li>
</ul>
You can specify the following parameters:
NOTE: sc means shortcode:
<ul>
<li>Title: Title. Leave blank for no title. (sc: title=”My Image List”)</li>
<li>Gallery: Leave blank to use all galleries or choose a gallery to use. (sc: gallery=”galleryid”)</li>
<li>Order: Order to display results in. You can choose; Random, Latest First, Oldest First, or NextGen Sortorder. Random will still work when a page is cached. (sc: order=”random”|”asc”|”desc”|”sortorder”)</li>
<li>Shuffle: If order is random and this is true will shuffle images with javascript. Useful if your are caching your pages. (sc: shuffle=”true”|”false”)</li>
<li>Orientation: Can pick vertical or horizontal defaults to vertical. (sc: orientation=”vertical”|”horizontal”)</li>
<li>Max pictures: The maximum amount of pictures to use. (sc: max_pictures=”6″)</li>
<li>HTML id: HTML id to use. Defaults to ‘image_list’. Needs to be different for multiple instances on same page. (sc: html_id=”image_list”)</li>
<li>Image width: All images with be assigned this width. (sc: width=”200″)</li>
<li>Image height: All images with be assigned this height. (sc: height=”150″)</li>
<li>Image gap: Gap between images. (sc: gap=”5″)</li>
<li>Center: Centers content in container. Requires width to be set. (sc: center=”1″)</li>
</ul>
Shortcode Examples:
<ul>
<li>[jj-ngg-image-list html_id=”about-image-list” gallery=”1″ width=”200″ height=”150″]</li>
</ul>
Try out my other plugins:
<ul>
<li>JJ NextGen JQuery Slider (https://wordpress.org/extend/plugins/jj-nextgen-jquery-slider/)</li>
<li>JJ NextGen JQuery Carousel (https://wordpress.org/extend/plugins/jj-nextgen-jquery-carousel/)</li>
<li>JJ NextGen JQuery Cycle (https://wordpress.org/extend/plugins/jj-nextgen-jquery-cycle/)</li>
<li>JJ NextGen Unload (https://wordpress.org/extend/plugins/jj-nextgen-unload/)</li>
<li>JJ SwfObject (https://wordpress.org/extend/plugins/jj-swfobject/)</li>
</ul>
<h3>Contributors</h3>
JJ Coder

JJ NextGen Image List

Allows you to pick a gallery from the 'NextGen Gallery' plugin to list images from. You can list images vertically or horizontally.

NextGEN Gallery Sidebar Widget vs JJ NextGen Image List