ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Skizzle Email - Skizzle is the most secure way to share end-to-end encrypted files through email, backed by blockchain
StealthChat - StealthChat is Encrypted, Private, Secure Calls and Chats on Android and Apple iOS