RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
Aircall - Aircall is a call center software of a new generation designed for fast growing companies. Setup instantly and integrates to your CRMs
Tutanota - Get your encrypted mailbox for free.