PenProtect is described as 'The most comprehensive and secure solution to password-protect the files within your USB Flash Drive, Flash Memory, Pen Drive or USB Stick' and is a Disk Encryption tool in the security & privacy category. There are more than 50 alternatives to PenProtect for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best PenProtect alternative is TrueCrypt, which is free. Other great apps like PenProtect are Axcrypt, Windows BitLocker, Encrypto and Secure Folder.
[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 PenProtect.
TrueCrypt is the most popular free alternative to PenProtect.
AxCrypt is a simple and effective open-source file encryption software. It integrates seamlessly into your workflow to encrypt, decrypt, store, send and work with files securely.
Axcrypt is the most popular Android, iPhone & iPad alternative to PenProtect.
BitLocker Drive Encryption is a data protection feature that integrates with the operating system and addresses the threats of data theft or exposure from lost, stolen, or inappropriately decommissioned computers.
Windows BitLocker is the most popular commercial alternative to PenProtect.
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.
Samsung Secure Folder lets you put to use the power of defence-grade Samsung Knox security platform to protect your files with a private, encrypted space on your phone. Apps and data moved to Secure Folder are sandboxed separately on the device and gain an additional layer of...
Secure Folder is the most popular Android Tablet alternative to PenProtect.
File Lock PEA is the most popular Open Source alternative to PenProtect.
Seahorse is a GNOME application for managing encryption keys and passwords in the GNOME Keyring.
Delivers AES 256-bit encryption, instant password-protected file and folder locking, file hiding, shredding, online backup, USB drive security, audit trail, and stealth mode features, supporting documents, videos, images, and wallet details across drives.
Challenger is a software for the encoding of files, folders and drives. For the installation and for the execution simple user rights suffice. Thereby the program is mobil usable on an USB flash drive too.
Lightweight Windows software enabling batch locking and unlocking of multiple local folders to prevent unauthorized access, reading, or deletion; folders become inaccessible from File Explorer, command line, or network shares, ensuring privacy and security for user data.
EncFS provides an encrypted filesystem in user-space. It runs without any special permissions and uses the FUSE library and Linux kernel module to provide the filesystem interface. You can find links to source and binary releases below.
LibreCrypt (formerly DoxBox) is an open-source disk encryption for Windows and the successor of FreeOTFE
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