backup-copy - my backup script - using this, I can keep a backup at a cost of only about 2Mb/day. Uses the hard-linking power of rsync(1)
fit - fits a bunch of files/directories into CD or DVD sized subdirectories ready for burning
m - pretty display of man pages (needs 'v' and a postscript or pdf viewer) eg
m less to get a pretty man page for less(1)
mass-mv - renames and or moves files according to a regex; can also clean up filenames removing whitespace and/or weird characters
newest - recursively list files in directories in date order. If called as oldest, reverse the sort direction. If called as biggest or smallest list by file size.
v - view or execute any type of file going rather beyond the scope of lessopen - in the simple case of a text file this is just shorthand for less(1)