Flickr Services
Flickr has an open Application Programming Interface (API for short). This means that anyone can write their own program to present public Flickr data (like photos, tags, profiles or groups) in new and different ways. There’s a long list of API methods available to you to work with.
Third Party Flickr Apps List
Flickr Hacks
you’ll learn how to:
Post photos to your blog directly from your cameraphone
Mash up your own photos or others’ public pictures into custom mosaics, collages, sliding puzzles, slideshows, or ransom notes
Back up your Flickr library to your desktop, and save the comments too
Set random desktop backgrounds and build your own Flickr screensaver
Geotag your photos and map your contacts
Download a list of photos and make a contact sheet
Make your own Flickr-style tag cloud to visualize the frequency of common tags
Build a color picker with a dynamic color wheel of Flickr photos
Feed photos to your web site and subscribe to custom Flickr feeds using RSS
Talk to the Flickr API using your web browser, Perl, or PHP; authenticate yourself and other users; and build custom API applications
Kubrickr
is a tool that lets you replace that giant blue blob at the top of your WordPress 1.5 blog with a nice photo from Flickr.
FAlbum – WordPress Flickr Plugin
is a Wordpress plugin that allows you to display your Flickr photos and photosets on your site.
FlickrRSS plugin for WordPress
is a plugin for WordPress that allows you to display Flickr photos on your weblog. The plugin supports user, public and group photostreams. It’s easy to setup and configure via an options panel. It also has image cache support.