GPGTools is described as 'Use GPG Suite to encrypt, decrypt, sign and verify files or messages. Manage your GPG Keychain with a few simple clicks and experience the full power of GPG easier than ever before' and is an app in the security & privacy category. There are more than 10 alternatives to GPGTools for a variety of platforms, including Windows, Linux, Web-based, iPad and iPhone apps. The best GPGTools alternative is GPG4Win, which is both free and Open Source. Other great apps like GPGTools are Lock GnuPG, Encrypto, Multron File Guardian and WinGPG.
Gpg4win enables users to securely transport emails and files with the help of encryption and digital signatures. Encryption protects the contents against an unwanted party reading it. Digital signatures make sure that it was not modified and comes from a specific sender.
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.
Multron File Guardian - A File Encrypter/Decrypter With Many Encryption Algorithm.
An open-source system tray utility for Windows, giving you quick access to your GnuPG keyring at any time with the ability to encrypt, decrypt and sign files on the fly.
gpg4usb is an easy to use, small portable editor with the possibility to encrypt and decrypt any text-message or -file you want. For encryption it acts as a GnuPG -frontend. Its intend is to be used from an usb-stick, running on Windows(TM) and.
Unicode Crypter is a portable tool that encrypts and decrypts any Unicode character from 1 to 1114111!
PGPigeon is a simple but powerful OpenPGP -compatible message encryption webapp based on the openpgp.js library.
Desktop Email Encryption provides an end-to-end email encryption solution that automatically encrypts and decrypts email directly from one user's client to another's without the need to log into a third-party website or by other means.
Paubox provides HIPAA compliant email encryption without the hassle of extra steps. Just send emails like normal from any device.
Encrypt Online is a secure, browser-based tool for encrypting, decrypting, encoding, and converting data, providing quick and reliable protection without software downloads.
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This isn't an alternative for a macOS specific app, which GPG Tools is.