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".

pekastel

Lets you pick a Creative Commons picture from Flickr and use it anywhere you want on your WordPress installation. The plugin will maintain attribution to the original Flickr author to keep peace with the CC Attribution License.
This plugin makes use of the newest WordPress 3.4 feature that allows to embed html in image captions, and also is backward compatible with older version of wordpress as well.
Features:
<ol>
<li>Search photos from flickr with creative commons license by tag (since version 1.2 you can search by any type of license)</li>
<li>Preview image results.</li>
<li>Define the order of the search results.</li>
<li>Automatically add image caption that links back to the original flickr owner.</li>
<li>Lets you use the standard features provided by WordPress for image editing:
<ul>
<li>Image alignment.</li>
<li>Cropping.</li>
<li>Rotating.</li>
<li>Flipping.</li>
<li>Resizing.</li>
</ul>
</li>
</ol>

Flickr – Pick a Picture

Lets you pick a Creative Commons picture from Flickr and use it anywhere you want on your WordPress installation.

User Access Manager – NextGEN Gallery Extension vs Flickr – Pick a Picture