PGP Everywhere - PGP Everywhere is an iPhone / iPad app that allows you to utilize the security of PGP encryption anywhere you type, in almost any app!
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
DESlock+ - DESlock+ is a suite of encryption instruments designed to shield in opposition to unintended storage platforms like the loss of a USB stick or computer and to allow relaxed collaboration and information sharing within the boundaries.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
KETS Quantum Key Distribution - KETS Quantum Key Distribution service is a utility that allows future-proof, quantum-safe communications at ultra-low power in a low-cost Quantum Key Distribution chip.
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.