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Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
Easy Message - Easy Message app comes up with features to help users in effortlessly sending text messages to a phone number, which is not in the contact list.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
Message Peeping Tom - Message Peeping Tom is an app by HSTAR, offers features that let you read your messages without giving the read report to the sender.
OpenKeychain - OpenKeychain helps you communicate more privately and securely.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.