http://www.rsnapshot.org/
rsnapshot is a perl utility that creates (illusory) filesystem snapshots using rsync and hardlinks (to save space). Every time a file is changed, a new copy is created, otherwise a hard link is used. It works hourly, daily or monthly.
http://rss2imap.sourceforge.net/en/
rss2imap is a little like feed2imap but much, much older (last change in rss2imap was 2006 vs 2008 for feed2imap). rss2imap is written in perl and needs a few perl modules installed to work.
http://cvs.librdf.org/cvsweb/redland/logger/
Perl based IRC logger
