The pool.ntp.org (ntppool) project is a big virtual cluster of timeservers striving to provide reliable easy to use NTP service for millions of clients without putting a strain on the big popular timeservers.
qpsmtpd is a flexible smtpd daemon written in Perl. Apart from the core SMTP features, all functionality is implemented in small "extension plugins" using the easy to use object oriented plugin API.
qpsmtpd was originally written as a drop-in qmail-smtpd replacement, but now it also includes smtp
... [More] forward, postfix, exim and maildir "backends". [Less]
pgeodns is a simple DNS server that can distribute load for a hostname to the nearest mirrors (as defined by geography; on the country / continent level).
It is used for search.cpan.org, the NTP Pool (http://www.pool.ntp.org/), ftp.perl.org and for http://svn.apache.org/