gm_alex

This release is a beta release, so error could occur. If you notice an issue please create a issue here: https://github.com/GM-Alex/user-access-manager-nextgen-gallery-extension/issues 
This plugin allows you to use the <a href="https://wordpress.org/extend/plugins/user-access-manager/" rel="ugc">User Access Manager</a>-Plugin to control the access for the <a href="https://wordpress.org/extend/plugins/nextgen-gallery/" rel="ugc">NextGEN Galley</a>-Plugin. You can lock Albums, Galleries and Images.
Feature list
<ul>
<li>Hide albums (if no access)</li>
<li>User-defined album content (if no access)</li>
<li>Hide galleries (if no access)</li>
<li>User-defined gallery title (if no access)</li>
<li>User-defined gallery content (if no access)</li>
<li>Hide images (if no access)</li>
</ul>

User Access Manager – NextGEN Gallery Extension

With this plugin you can use the "User Access Manager" to control the access for the "NextGen Gallery".

Parakoos

This wordpress plugin allows visitors to browse posts or pages by their images, displayed randomly on an infinitely scrollable Image Wall. The images link back to the post or page on which they are attached.
Images are powerful. They catch our attention like nothing else. You probably use them in your blog posts to anchor the fickle attention span of today’s readers. Display all these great images on a nice looking page, and your visitors will browse for a while, captivated. Hopefully, one image will stand out for whatever reason and compel the visitor to click it to find out more. And just like that, some old blog post you thought buried by the sands of time has gotten another view, thanks to your Image Wall.
You can see the plugin in action on my own <a href="http://www.themodernnomad.com/image-wall/#utm_campaign=Image_Wall&utm_source=wordpress&utm_medium=website&utm_content=description" rel="nofollow ugc">Image Wall</a> and the full plugin documentation on the <a href="http://www.themodernnomad.com/image-wall-plugin/#utm_campaign=Image_Wall&utm_source=wordpress&utm_medium=website&utm_content=description" rel="nofollow ugc">Image Wall Plugin page</a>.

Image Wall

Browse posts/pages by their images, displayed randomly on an infinitely scrollable page. The images link back to where they are attached.

User Access Manager – NextGEN Gallery Extension vs Image Wall