1. VeraCrypt is a free disk encryption software brought to you by IDRIX and that is based on TrueCrypt .
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  2. [TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.] TrueCrypt is a disk encryption software for Windows Vista/XP, Mac OS X, and Linux.

    Discontinued

    Currently unmaintained. Last version, TrueCrypt 7.1a, is still available for download and development has continued via the forks VeraCrypt and CipherShed. "The development of TrueCrypt was ended in 5/2014 after Microsoft terminated support of Windows XP. Windows 8/7/Vista and later offer integrated support for encrypted disks and virtual disk images."

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  3. 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.
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  4. 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.
  5. A fork of the now-discontinued TrueCrypt. CipherShed is a program that can be used to create encrypted files or encrypt entire drives (including USB flash drives and external HDDs).

    Discontinued

    No releases since Sep 6, 2017. See https://www.ciphershed.org/news/

  6. DiskCryptor is the only truly free solution, provided under GNU General Public License (GPLv3), which offers encryption of all disk partitions, including the system partition.
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  7. A program to mount EncFS folders on Windows and OS X. Works good with LibreOffice documents on Windows 7.
  8. The enterprise cryptographic filesystem for Linux
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  9. With EDS (Encrypted Data Store) you can store your files in the encrypted container to prevent unauthorized access to sensitive information. TrueCrypt container files are supported.
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  10. LibreCrypt (formerly DoxBox) is an open-source disk encryption for Windows and the successor of FreeOTFE Change of name to 'LibreCrypt' in version 6.2 Features: Easy to use, with a 'wizard' for creating new 'DoxBoxes'.
  11. FileVault is a method of using encryption with volumes on Mac computers. Encryption and decryption are performed on the fly. FileVault 2 uses full disk, XTS-AES 128 encryption to help keep your data secure. Using FileVault 2, you can encrypt the contents of your entire drive.
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  12. LUKS Manager provides on-the-fly encryption (AES by default) to virtual folders on Android devices. These virtual folders can be dynamically mounted, unmounted, created and deleted as needed. Similar to Truecrypt in functionality.

    Discontinued

    Website and app unavailable.

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  13. This app eases the use of mounting (loading) encrypted partitions (also called Volumes), a disk drive may consist of several of those areas, usually represented by a drive letter.
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  14. 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.
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  15. The realcrypt application in the RPM Fusion repo is an encryption application based on truecrypt, freely available at http://www.truecrypt.org/.