Apps similar to OpenPGP include GnuPG, which is free and open source. Other options are Multron File Guardian, iPGMail, S/MIME and Xecrets Ez. In total there are six File Encryption Software like OpenPGP for Mac, Windows, Linux, iPhone and iPad.
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.
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Multron File Guardian - A File Encrypter/Decrypter With Many Encryption Algorithm.
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With governments and corporations increasingly infringing upon our privacy, we must take steps to protect our private communications and files. With OpenPGP encryption, you can secure your messages and files to ensure that only the intended recipients are able to read them.
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S/MIME (Secure/Multipurpose Internet Mail Extensions) is a standard for public key encryption and signing of MIME data. S/MIME is on an IETF standards track and defined in a number of documents, most importantly RFCs 3369, 3370, 3850 and 3851.
Xecrets Ez is an easy to use personal desktop application available for Windows, Mac and Linux. It is 100% compatible with AxCrypt, but is less complex without the bells and whistles.
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