OpenKeychain is described as 'Helps you communicate more privately and securely. It uses high-quality modern encryption to ensure that your messages can be read only by the people you send them to, others can send you messages that only you can read, and these messages can be digitally signed so' and is an app in the security & privacy category. There are eight alternatives to OpenKeychain for a variety of platforms, including Linux, Android, Android Tablet, Mac and Windows apps. The best OpenKeychain alternative is GnuPG, which is both free and Open Source. Other great apps like OpenKeychain are Kleopatra, Enigmail, APG and Lockystar.
GnuPG allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key directories. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications.
Enigmail is a security extension to Mozilla Thunderbird and SeaMonkey. It enables you to write and receive email messages signed and/or encrypted with the .
Lockystar is a file encryption application. It allows you to encrypt individual files wherever they are located—on your cloud drive or on your hard drive.
CipherMail for Android is an Android application which can be used with your existing Android mail application to send and receive S/MIME digitally signed and encrypted email with an Android smartphone.
PGPkeygenerator.com is an Open Source, free, online and secure PGP key generator.
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