Guahan Web

This plugin uses the Flickr RESTful API to retrieve the specified number of images for the specified user for display in 
the sidebar of your WordPress blog. The display of the widget is customizable by defining the title as well as the number 
of rows and the number of images per row.

Guahan Flicker Widget

This widget will allow you to display your newest Flickr images easily in your sidebar.

yu-ji

hiddentao

WordPress Flickr Embed is a WordPress plugin that provides an interactive interface for adding Flickr images to your posts. The interface is conveniently launched from the visual editor toolbar.
This is a fork of the (https://wordpress.org/extend/plugins/wordpress-media-flickr/) plugin for WordPress and provides numerous bug fixes and enhancements over the original.
<h4>Features</h4>
<ul>
<li>Search for an select any public photo or a private one from your photostream (requires Flickr authorization).</li>
<li>Sort search results by date taken or date posted</li>
<li>Insert a photo anywhere in your post, choosing its title, size and how it should be aligned to the text.</li>
<li>Link the photo back to its Flickr page or to a different-sized version of itself.</li>
<li>Supports Lightbox and Lightview popups.</li>
</ul>
Source on Github: https://github.com/hiddentao/wp-flickr-embed
Note: This plugin requires PHP 5.2.

WordPress Flickr Embed

Wordpress Flickr Embed is a Wordpress plugin that provides an interactive interface for adding Flickr images to your posts.

Guahan Flicker Widget vs WordPress Flickr Embed