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' and is a well-known app 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. The best alternative is GPG4Win, which is both free and Open Source. Other great apps like GnuPG are Enigmail (Free, Open Source), AES Crypt (Free, Open Source), Encrypto (Free) and Axcrypt (Freemium).
- Encrypto lets you encrypt files before sending them to friends or coworkers. Just drop a file into Encrypto, set a password, and then send it however you normally would — but this time with added security. It’s free for both Mac and Windows. View 89 alternatives to Encrypto
- Free • Proprietary
- AxCrypt is a simple file encryption software for Windows. It integrates seamlessly with your workflow to encrypt, decrypt, store, send and work with files. View 96 alternatives to Axcrypt
- Freemium • Proprietary
Axcrypt vs GnuPGAs far as I see, Axcrypt is a file encryptor. But GnuPG (and PGP generally) is targeted mostly for email body encryption and signing: not only files and not only encryption. Also, Axcrypt is for Windows only.