Steel Bank Common Lisp (SBCL) is a Open Source development system for
ANSI Common Lisp. It provides an interactive environment including an
integrated native compiler, interpreter, and debugger.
SIOD is a small-footprint implementation of the Scheme programming
language that is provided with some database, Unix programming and cgi
scripting extensions.
Erlang is a programming language used to build massively scalable soft
real-time systems with requirements on high availability.
This port provides WX bindings for Erlang.
Warns when the user composes a message mentioning an attachment in
the message body without attaching any files to the message.
Abook is a text-based addressbook program designed to use with mutt mail
client. Abook runs on Linux, FreeBSD and some other UNIXes.
sgwi is a web interface to SQLGrey written in PHP.
It allows you to edit the white- and blacklists as
well as the current state of the greylist.
The DomainKeys Library is being written in C and provides a foundation
for implementing the DomainKeys email authentication system in mail
transfer agents and mail user agents.
libsrs2 is the next generation SRS library from the original designer of SRS.
It implements the Sender Rewriting Scheme, a part of the SPF/SRS protocol pair.
Mailgraph is a very simple mail statistics RRDtool frontend for Postfix
that produces daily, weekly, monthly and yearly graphs of received/sent
and bounced/rejected mail.
A free & open modern, fast email client with user-friendly encryption and
privacy features.
Mailpile is still in beta, but many people already find it useful.