delorean
delorean is the script I use to backup my notebook. It works a bit like Apple's TimeMachine or rsnapshot, but doesn't need a blockdevice, iSCSI or a directory as destination, instead it uses the good old SSH (with rsync and hardlinks). I run it in an hourly cronjob.
leo
leo is a simple bash script to query dict.leo.org (in fact it's pda.leo.org) on the commandline. I use it every day, because it is a fast way of looking up words in a dictionary.
stau
stau is also a simple bash script, it queries dradio.de, to show me whether the Autobahn I use is free or not. One day I will rewrite it in Perl...