Alternatives to FileWall for all platforms with any license

TrueCrypt

[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...
- Discontinued
  Currently unmaintained. Last version, TrueCrypt 7.1a, is still available for download and development has continued via the forks https://alternativeto.net/software/veracrypt/ and https://alternativeto.net/software/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."
Free Open Source Mac Windows Linux
Drive Encryption Encryption Portable Security focused Add a feature

861 Like
GnuPG

GnuPG allows to encrypt and sign your data and communication, features a versatile key management system as well as access modules for all kinds of public key...

Free Open Source Mac Linux PortableApps.com Xfce OpenPGP
PGP Encryption Encryption Encrypted Email Add a feature

124 Like
Windows BitLocker

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...

Commercial Windows
Create bootable USB Drive Encryption Encryption ... Location Mapping Windows Explorer extension Add a feature

28 Like
AES Crypt

AES Crypt is an advanced file encryption utility that integrates with the Windows shell or runs from the Linux command prompt to provide a simple, yet powerful, tool for...

Free Open Source Mac Windows Linux Android iPhone ... Android Tablet iPad
AES encryption Data-encryption Dims background windows Password protection Add a feature

52 Like
CipherShed

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/
Free Open Source Mac Windows Linux
Data-encryption Password protection Add a feature

29 Like
EncFS

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...
- Warning
  The author has agreed that EncFS in its current form is dangerous (to security) for several reasons. Wikipedia has a brief summary: https://en.wikipedia.org/wiki/EncFS#General_Security_Concerns The actual audit, which the author participated in, is here: https://defuse.ca/audits/encfs.htm
Free Open Source Mac Linux BSD
Encryption Add a feature

26 Like
Kleopatra

It supports managing X.509 and OpenPGP certificates in the GpgSM keybox and retrieving certificates from LDAP servers.

Free Open Source Windows Linux GnuPG
Gpg encryption Add a feature

10 Like
Encrypto

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...

Free Mac Windows
Pdf encryption Encrypted Lightweight Add a feature

11 Like
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GPG Suite

GPG for Mail is an open source plugin for Apple Mail. Encrypt, decrypt, sign and verify mails using OpenPGP with a few simple...

Commercial $ $ $ Open Source Mac GnuPG
Encrypted Email Encrypted Add a feature

9 Like
DiskCryptor

DiskCryptor is the only truly free solution, provided under GNU General Public License (GPLv3), which offers encryption of all disk partitions, including the system...
- Discontinued
  The last update was released 09.07.2014.
Free Open Source Windows
Encryption Add a feature

30 Like