<li>A web server, such as <a href="http://www.apache-ssl.org">Apache-SSL</a> or <a href="http://www.apache.org">Apache</a>
<li><a href="ftp://ftp.cs.hut.fi/pub/ssh/">SSH</a>
<li><a href="http://www.perl.com/CPAN/doc/relinfo/INSTALL.html">Perl</a> (at least 5.004_04)
- <li>A database engine supported by Perl's <a href="http://www.hermetica.com/technologia/DBI/">DBI</a>, such as <a href="http://www.tcx.se/">MySQL</a> or <a href="http://www.postgresql.org/">PostgreSQL</a>
+ <li>A database engine supported by Perl's <a href="http://www.hermetica.com/technologia/DBI/">DBI</a>, such as <a href="http://www.tcx.se/">MySQL</a> or <a href="http://www.postgresql.org/">PostgreSQL</a> (see the <a href="postgresql.html">PostgreSQL notes</a>)
<li>Perl modules
<ul>
<li><a href="http://www.perl.com/CPAN/modules/by-module/Array/">Array-PrintCols</a>