The Flickr API is available for non-commercial use by outside developers. Commercial use is possible by prior arrangement.
Photo Upload API
Request Formats
Response Formats
Note: The API kits are not maintained or supported by Flickr and are used at your own risk. For API kit support please join the developers mailing list or contact the maintainers directly.
ActionScript
C
Cold Fusion
Common Lisp
cUrl
Delphi
Go
Java
.NET
Node.js
Objective-C
Perl
PHP
PHP5
Python
REALbasic
Ruby