GnuPG is described as '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' and is a very popular file encryption software in the security & privacy category. There are more than 25 alternatives to GnuPG for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best GnuPG alternative is Cryptomator, which is both free and Open Source. Other great apps like GnuPG are GPG4Win, Kleopatra, OpenKeychain and OpenPGP.
OneTime is an open source encryption program that uses the one-time pad algorithm to allow two parties to communicate privately. It has features to assist with the bureaucracy of pad management, and comes with built-in help. OneTime requires Python 2.
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