listadmin is a commandline tool to manage Mailman lists and proccess queues, without the need to go to the Mailman web interface. It allows you to inspect messages or subscription requests, approve or discard them manually, or discard messages automatically when certain conditions are true. listadmin can also be configured to run out of cron to do routine cleaning.
This is a commandline date/time manipulation and formatting program, very useful in scripts. You can easily add or subtract days, hours and/or minutes from a specified date. Supports all date(1) output formats plus more.
Lurker is a mailing list archiver designed for capacity, speed, simplicity, and configurability in that order.
Noteworthy features include: google-style searching on all fields, chronology preserving threads, multilingual, and attachment support.
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PIWI is a java based system for managing subscribers and mailinglists and sending newsletters. It runs as webapplication (war) or as standalone application for your desktop, with embedded database (hsql) and webserver. You can use it also per commandline
This newsletter tool started as a unix-geeks-only tool made in Perl with a SQLite DB. But it is fast evolving into a multi-purpose newsletter management tool usable within large corporations. For all features visit http://keepintouch.sourceforge.net/
A log archival and analysis tool for XMail email servers. The tool will also analyze the logged data and email administrative reports. Written in PHP, the tool can be run on many platforms. For XMail itself, please see www.xmailserver.org.