OpenKeychain Alternatives

Kleopatra is a certificate manager and GUI for GnuPG.

YAATA app offers features that let you send multimedia files such as images, videos, audio, and GIFs, etc.

Warm up your cold email inbox, and never land in spam anymore!

Try for free freemium $9.0 / Monthly

Security extension to Mozilla Thunderbird and SeaMonkey

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.

CipherMail for Android is an Android application which can be used with your existing Android mail...

Cellcrypt app provides features so you can enjoy secure conference calling, messaging, and sharing of documents.

Message Peeping Tom is an app by HSTAR, offers features that let you read your messages without giving the read report to the sender.

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.

SMS Plus app offers features that let you forward text messages through internet connection as well as through other social media platforms.

Seecrypt app allows users to do secure voice and conference calls by using advanced encryption features so they can contact their friends, colleagues, and family members without any privacy issues.

Convenient End-to-End Encryption for E-Mail

GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).

Open Source

Mailvelope open source project. OpenPGP in your browser.