MailStore - MailStore Home - A 100% free single-private-user desktop solution
Grabbly - A simple and elegant tool for all your data extraction needs
MailSteward - MailSteward : The Ultimate E-mail Manager for Mac OS X
Spider Free - Spider Free helps developers to turn any website content into structured data that they can use for any purpose.
Gmvault - Backup the emails in your Gmail account.
AnyPicker - Scrape web data without any code, just click what you see.