SMS Plus - SMS Plus app offers features that let you forward text messages through internet connection as well as through other social media platforms.
Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
Cellcrypt - Cellcrypt app provides features so you can enjoy secure conference calling, messaging, and sharing of documents.
GPG Suite - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
PhoneLeash: SMS/MMS forwarding - PhoneLeash: SMS/MMS forwarding app offers features that let you forward your desired text messages and multimedia messages to your email or your other mobile phone so that you can access them later.
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).