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
TopFeeder is a web application which takes a list of feeds that you create and sends you a daily email with new items from those feeds. Your news is delivered to your inbox so that you don't have to check each web site.
JEM is an SMTP server with pluggable components that let you
process email in any way you like. It can also extend beyond
emails into generalised message processing (like JMS) and can
even generate its own messages based on a Cron-like facility.
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Ichabod is an SMTP/POP3 server, with mailing list support. Administration is via a web, or email
You can also use Ichabod to make your app receive email as an SMTP server.
You can also easily extend it by subclassing to add your own behaviors.
Simple Ajax Wiki that stores wiki pages into FileSystem or Subversion. It uses wikimodel syntaxe, JQuery for HTML DOM manipulation, DWR for Ajax and Spring for J2EE