Tomb is described as '100% free and open source system for file encryption on GNU/Linux, facilitating the backup of secret files. Tomb is written in code that is easy to review and links commonly shared components' and is an app. There are more than 10 alternatives to Tomb for a variety of platforms, including Linux, Windows, Mac, Android and BSD apps. The best Tomb alternative is VeraCrypt, which is both free and Open Source. Other great apps like Tomb are Cryptomator, Picocrypt, LUKS and DroidFS.
Picocrypt NG (new generation) is a very small (hence Pico), very simple, yet very secure encryption tool that you can use to protect your files. It's designed to be the go-to tool for file encryption, with a focus on security, simplicity, and reliability.
A free and open-source file encryption software for Linux, Windows and Mac that encrypts/decrypts files so they can be stored securely, utilizing compression, Reed–Solomon Error Correction, encryption and keys derived from the user's password with Argon2id.
Cryptmount is a powerful utility that allows any user to access encrypted filesystems on-demand under GNU/Linux systems without requiring root privileges.It requires Linux 2.6 or higher. It handles both encrypted partitions as well as encrypted files.
