WinGPG is described as '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' and is a file encryption software in the security & privacy category. There are more than 10 alternatives to WinGPG for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best WinGPG alternative is TrueCrypt, which is free. Other great apps like WinGPG are GnuPG, GPG4Win, Kleopatra and Lock GnuPG.
[TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.]
TrueCrypt is the most popular Windows, Mac & Linux alternative to WinGPG.
TrueCrypt is the most popular free alternative to WinGPG.
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.
GnuPG is the most popular Open Source alternative to 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.
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.
Lockystar is a file encryption application. It allows you to encrypt individual files wherever they are located—on your cloud drive or on your hard drive.
Lockystar is the most popular Android & Android Tablet alternative to WinGPG.
Tella is a mobile app designed to protect human rights defenders, advocates, and journalists by encrypting and hiding their sensitive data and safely uploading it to their organization's server.
Tella is the most popular iPhone alternative to WinGPG.
PGP for Windows, MacOS and linux. Desktop application to encrypt and decrypt PGP files. It's free and easy to use. OpenPGP compatible.
PGP Tool is the most popular commercial alternative to WinGPG.
Digital Safe and Password management to protect your data and privacy.
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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It's more actively developed