Knox is described as 'Offers easy disk image encryption and comes with a built-in backup service. Knox can automatically back up any or all vaults to a local hard drive, an iPod, an iDisk, or a network volume. Gives you many of the benefits of FileVault or individual encrypted disk images via an' and is a Disk Encryption tool in the backup & sync category. There are more than 25 alternatives to Knox for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best Knox alternative is TrueCrypt, which is free. Other great apps like Knox are LUKS, Windows BitLocker, Encrypto and EDS (Encrypted Data Store).
[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 Knox.
TrueCrypt is the most popular free alternative to Knox.
LUKS is the standard for Linux hard disk encryption. By providing a standard on-disk-format, it does not only facilitate compatibility among distributions, but also provides secure management of multiple user passwords.
LUKS is the most popular Open Source alternative to Knox.
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 Knox.
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.
With EDS (Encrypted Data Store) you can store your files in the encrypted container to prevent unauthorized access to sensitive information.
EDS (Encrypted Data Store) is the most popular Android & Android Tablet alternative to Knox.
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 Knox.
FreeOTFE is a free, open source, "on-the-fly" (OTFE) disk encryption program for PCs running MS Windows and Windows Mobile PDAs (FreeOTFE4PDA).
DiskCryptor is a free and open-source utility that offers encryption of all disk partitions, including the system partition. Originally conceived as a replacement for DriveCrypt Plus Pack and PGP Whole Disk Encryption (WDE), the project aims to create the best product in its...
Seahorse is a GNOME application for managing encryption keys and passwords in the GNOME Keyring.
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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You can encrypt files and folders and workshop smoothly between OSX and Windows. It is not a vault like Knox.