What are some alternatives?
When comparing GPGTools and DigiVault, you can also consider the following products
Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
GPG Suite - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
Encrypto - Encrypto lets you encrypt files before sending them to friends or coworkers.
GPG4Win - GPG4Win is an encryption program for files and emails. The program encrypts emails and files so that they can only be read by those intended to receive them.
BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box and many others.