Flickr-fetcher is a project mainly written in Perl, it's free.
Downloader for Flickr Photos
This is Perl module FlickrFetcher.
INSTALLATION
Download it, unpack it, then build it as per the usual:
% perl Makefile.PL
% make && make test
Then install it:
% make install
DOCUMENTATION
FlickrFetcher documentation is available as in POD. So you can do:
% perldoc FlickrFetcher
to read the documentation online with your favorite pager.
Yusuke Wada