NeoCertified Secure Email - NeoCertified is a solution that provides secure email encryption for businesses and organizations across all industries, including healthcare, finance, legal, non-profit and education.
Mailvelope - Mailvelope open source project. OpenPGP in your browser.
Proofpoint Email Encryption - As email is the preferred medium for business communications, preventing confidential information from being leaked in outbound email messages must be a top priority in order to lower the risk of a data breach.
Bazzacuda - Barracuda Networks is the worldwide leader in Security, Application Delivery and Data Protection Solutions.
SendSafely - SendSafely operates a zero knowledge, end-to-end encrypted file exchange platform
MailStore - MailStore Home - A 100% free single-private-user desktop solution