What are some alternatives?
When comparing GPGTools and Kleopatra, you can also consider the following products
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.
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.
Axcrypt - We have a newer web site! Visit axcrypt. net instead! AxCrypt - Password Protect Files With Strong Encryption. AxCrypt is the leading open source file encryption software for Windows.
PGP Tool - PGPTool allows you to encrypt and decrypt files. It's free and easy to use.
AES Crypt - AES Crypt is an advanced file encryption utility that integrates with the Windows shell or runs from the Linux command prompt to provide a simple, yet powerful, tool for encrypting files using the Advanced Encryption Standard (AES).