imapsync - Console-based utility for migrating IMAP mailboxes.
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
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.
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs