Z39.50

Client Software:

http://lcweb.loc.gov/z3950/agency/resources/software.html

http://www.ilrt.bris.ac.uk/discovery/z3950/resources/#software

http://www.indexdata.dk/simpleserver/

http://www.crxnet.com/zunix.html

http://search.cpan.org/doc/MIRK/Net-Z3950-0.27/Z3950.pm