With the Flickr C# library by Sam Hudson, users can access the methods of the Flickr REST API. The aim of this library is to facilitate authentication and API call. API features that users can obtain include retrieve photos, share feeds of photos and videos, and upload photos and videos.
Photo editing service Aviary has added a new HTTP-based API that allows developers to pass photos through filters, effects and even basic editing operations. Aviary "soft-launched" the new Aviary Effects API last week at SXSW, when we interviewed Aviary's Michael Galpert (video below). The new service could be used to create photo-sharing services like Instagram, CMS plugins to aid workflow or within social applications to create a standard look to all avatars.