Preloadr
Preloadr offers free photo editing for Flickr. Simply log in to Flickr and authorize Preloadr to access your photostream you can then choose images to crop, flip or rotate.

Flexplore
Flexplore allows you to view photos that have been seen before and finds new photos that match your tastes and likings.

Gickr
Instantly create Animated GIF online, free, by grabbing photos from your Flickr.

Flickrmap
Put a flash based world map on your own website or blog.

WordPress Flickr Post Bar plugin
Easily insert your Flickr photos into your blog posts.

Flickratr
Vote between 1-10 for different flickr images.

FAlbum
WordPress plugin that allows you to display your Flickr photos and photosets on your site.