foter

Foter is the easiest and fastest way to add Creative Commons photos to your blog. We find and host millions of photos from many online sources and make them available to be included in your blog posts.
This plugin lets you seach, manage and add Creative Commons photos to your blog posts in a very simple way.
Some of the features:
<ul>
<li>
Image resizing: flexibility and preview feature
</li>
<li>
Image download: you can use plugin or simply download image from foter.com website
</li>
<li>
Attribution info: all attribution information is automatically added to the photo, so you don’t need to add it manually
</li>
<li>
Search photos: you can search photos by tags or keywords
</li>
<li>
Speed: very fast and easy to use
</li>
</ul>
Website: <a href="http://foter.com/" title="Free Stock Photos Foter.com" rel="nofollow ugc">Free Stock Photos Foter.com</a>

Free Stock Photos Foter

This plugin lets you easily search, manage and add free photos (more than 180 mln of them) to your blog posts.

david wolfpaw

This plugin allows you to add a button to your site’s posts which will display terms and licensing for Creative Commons reposting, as well as the title and content of the post for easy sharing. This is useful for sites that want to easily and clearly share their content with others.
<h3>Usage</h3>
<ol>
<li>Install and activate the plugin.</li>
<li>Navigate to the Creative Commons settings page under Settings in the WordPress dashboard.</li>
<li>Edit the terms text andv select the license type that you want to use as a default.</li>
<li>On individual posts, you can select a different license type to use, or set that particular post to not Creative Commons licensed.</li>
</ol>

Creative Commons Post Republisher

I spent an entire afternoon trying different CC plugins, and this one was the ONLY one that did what I wanted. It has a meta box on every post that lets you choose the license for that page. Magic. 

Best I've found so far

This plugin allows you to add a button to your site's posts which will display terms and licensing for Creative Commons reposting, as well as the …

Free Stock Photos Foter vs Creative Commons Post Republisher