Picsviewr
Picsviewr provides a wide variety of slideshows (currently 7) for viewing your Flickr photos with more flexibility. Every Flickr user has a slideshow here. There is no need to create an account or configure anything and your preferences are saved.
Travelr
Travelr is a free photo gallery viewer that you can put on your own site. Travelr lets you display your Flickr photos geographically on a world map.
FlickrFight
FlickrFight is a new Website which helps you to compare the Images. You select the keywords or tags to be contested. The one with the most images on site, wins the fight.
Retrievr
Retrievr is an experimental service which lets you search and explore in a selection of Flickr images by drawing a rough sketch.
Multicolr Search Lab
With the Multicolr Search Lab, you can browse through 10 million of Flickr’s most interesting Creative Commons images, and find ones that share the same colours. Choose up to 10 colours from our palette of 120 different shades.
Flickr Color Selectr
Flickr Color Selectr allows you to search for images on Flickr based on the primary color within the image.
Tilt Viewer
A free, customizable 3D Flash image viewing application.
FlickrVision
Flickrvision is a webapp that displays the newest uploads to Flickr. As the globe spins, photos pop up from every continent, featuring landscapes, architecture, people, animals, food, and anything imaginable.
depictr
Type in some lyrics and retrieve related photos from Flickr.