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Free Open Source:Swiss File Knife
a command line
free external tools,
StahlWorks Open BCrypt
Fully portable command line file encryption.
Note: this tool has nothing to do with the Linux bcrypt utility.
It's a completely independent development, written during my time at the internet banking company Brokat Infosystems in 1999.
The goal was to provide a fully portable command line tool that does secure single file en/decryption on every operating system with good security. Open bcrypt uses RC4 and, most important, dynamic passphrase stretching which converts a passphrase to a long hash in as many cycles as possible within 500 milliseconds.
Last update is version 1.7.2 of Jun-2023, with support for files > 2 gb.