Tools

Faces Archive
Collected and mirrored sources for software that can use picons databases containing personal icons of users, domains and newsgroups on the net.
http://www.cs.indiana.edu/ftp/faces/index.html

Filtering Mail FAQ
General filtering strategies and instructions for using procmail, mailagent, and the Elm filter program to filter mailing list messages into separate folders.
http://ii.best.vwh.net/internet/faqs/launchers/mail/filtering-faq/

HWG Filtering FAQ (Windows, Mac, Unix)
The HTML Writers' Guild's FAQ sheet about mail filtering systems (multiple platforms)
http://www.hwg.org/resources/faqs/filterFAQ.html

Infinite Ink's Robots and Mail Filtering
A good collection of links about mail robots and e-mail filtering (somewhat slanted towards Unix applications)
http://www.ii.com/internet/robots/

InterGuru's E-Mail Address Conversions
Convert e-mail client address books between Netscape, Eudora, Juno, Unix Mail, csv, Pegasus, Pine, Databases, ccMail, Microsoft Internet Mail, Spry, Compuserve, ldif and Elm.
http://www.interguru.com/mailconv.htm

MailGoGoGo
MailGoGoGo prevents unwanted e-mail from reaching an inbox. Available for Macintosh and Windows.
http://www.makienterprise.com/mailgogogo/mailgogogo.html

Mail2RDF
A small tool which checks your inbox and produces a RSS news feed from subjects of unread/unseen mails.
http://sourceforge.net/projects/mail2rdf

MailWash
JavaScript to clean out quoting marks and extra line breaks in e-mail messages.
http://www.desklampllc.com/op.onza.net/mailwash/

NotifyMail Software
Software to receive a server signal to check for new mail. Available for Macintosh and Windows.
http://www.notifymail.com

Picons Archive
Databases, documentation, sources and sampler for picons, personal icons of users, domains and newsgroups on the net.
http://www.cs.indiana.edu/picons/ftp/index.html

Smileys
Small book from O'Reilly.
http://oreilly.com/catalog/9781565920415/