Karrde

Displays thumbnails from Flickr based on the user/group/tag you provide.

Flickr Thumbnails Widget

Displays thumbnails from Flickr based on the user/group/tag you provide.

Robert Peake

Robert

Embeds a responsive slideshow of Flickr images from any album or photoset
Shortcodes are of the format: <code>[fshow url=https://flic.kr/s/aHsiP3Xyxx]</code> or <code>[fshow photosetid=72157627847553181]</code>
The default parameters for api key, username, user_id and photosetid can have values set using the plugin options page that will then be used by default whenever they are omitted from the shortcode.

Responsive Flickr Slideshow

Does the trick

Embeds a responsive slideshow of Flickr images from any album or photoset

Flickr Thumbnails Widget vs Responsive Flickr Slideshow