daitrix is a secure os built on security, ease of use, and linux/unix based. verry fast to install with 4 setup types- dev, server, desktop and all. everything a normal linux distro has and then some.
LIMeTool (pronounced like the fruit), is intended to be a simple and easy interface for managing accounts on an integrated Sendmail/LDAP/Cyrus IMAP installation. It's written in PHP and is realitively easy to configure and expand.
TkSftp - an X wrapper for the OpenSSH sftp console client