Clearbit - Clearbit provides Business Intelligence APIs
imapsync - Console-based utility for migrating IMAP mailboxes.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Gmvault - Backup the emails in your Gmail account.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.
Cryoserver - Cryoserver is an all-in-one email archiving solution that empowers you to preserve your email in a tamper-evident archive, making you transform your data into a useful archive for everyday use.