Unimus - Unimus is a Network Automation and Configuration management (NCM) solution designed for fast deployment network-wide and ease of use. Unimus does not require learning any abstraction or templating languages, and does not require any coding skills.
imapsync - Console-based utility for migrating IMAP mailboxes.
Oxidized - configuration backup software (IOS, JunOS) - silly attempt at rancid
MailStore - MailStore Home - A 100% free single-private-user desktop solution
RANCID - RANCID - Really Awesome New Cisco confIg Differ.
audriga Email and Groupware migration - Easily migrate your email, contacts, calendar items and tasks to your new provider or server. No software installation is required.