OpenKeychain: Easy PGP
Hardware Security SDK
Proton Mail: Encrypted Email
Proton AG
FlowCrypt Encrypted Email
FlowCrypt a.s.
SecureMyEmail Encrypted Email
WiTopia, Inc.
EPRIVO Encrypted Email & Chat
BlueRiSC Inc.
Gmail
Google LLC
Easy PGP
Omundo
PGP Tool
Vengito
OnMail - Encrypted email
Edison Software
StayPrivate
StayPrivate Ltd