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:
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Image resizing: flexibility and preview feature
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Image download: you can use plugin or simply download image from foter.com website
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Attribution info: all attribution information is automatically added to the photo, so you don’t need to add it manually
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Search photos: you can search photos by tags or keywords
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Speed: very fast and easy to use
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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.

Haldaug

This plugin adds support for providing licensing information for images uploaded in the media library. The user can input the Creative Commons licensing information in custom fields in the media post. The licensing information is displayed underneath the image in the wp-caption element.
<h4>Credits</h4>
This plugin is based on the code given in the tutorial ‘How to Add Custom Fields to Attachments’ by Guillaume Voisin: <a href="http://wp.tutsplus.com/tutorials/creative-coding/how-to-add-custom-fields-to-attachments/" rel="nofollow ugc">wp.tutsplus.com</a>

Creative Commons Tagger

Adds support for tagging images with creative commons licenses.

Free Stock Photos Foter vs Creative Commons Tagger