tag-not-ed: a primitive (but awesome) tool for managing a large collection of text files
tesh: a console TExt SHell written in Python
litetrash: a light-weight trash can for some UNIX systems.
newdocms: a new document management system.
libtrash: the complete and feature-rich trash can for GNU/Linux.
getattached.perl: a simple Perl script which allows you to automate the retrieval of email attachments from POP3 accounts and immediately deletes those messages.
pgsearch: a Perl script which allows you to (remotely) search all etexts available at Project Gutenberg's site.