2BrightSparks
Toolset for fingerprinting (FingerPrint), zur hash calculation (HashOnClick), symetric encryption (EncryptOnClick) and wiping (DeleteOnClick).

CrypTool
Software which enables to apply and analyze cryptographic mechanisms.

Gpg4win
EMail and file encryption software.

Open Source Tripwire
Security and data integrity tool useful for monitoring and alerting on specific file change(s) on a range of systems.Cryptographic hashes are employed to detect changes in a file without storing the entire contents of the file in the database..

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TrueCrypt
on-the-fly encryption (OTFE) program for Microsoft Windows 2000/XP/2003/Vista and Linux. It can create a "file-hosted container" which consists of an encrypted volume with its own file system, contained within a regular file, which can then be mounted as if it were a real disk. TrueCrypt also supports device-hosted volumes, which can be created on either an individual partition or an entire disk. Supported encryption algorithms are: AES-256, Serpent, Twofish

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Steganography Tools
Steganography is the art and science of writing hidden messages in such a way that no one apart from the sender and intended recipient even realizes there is a hidden message.

KeePass
Password manager which encrypts the whole password database using a master key or a key file. Main features are strong encryption, multiple user keys, imort/export to TXT, HTML, XML and CSV files, support of password groups, time fields and entry attachments, searching and sorting, password generator and plugin architecture.

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7-ZIP
File archiver which can pack and unpack the formats 7z, ZIP, GZIP, BZIP2, TAR. The formats RAR, CAB, ISO, ARJ, LZH, CHM, Z, CPIO, RPM, DEB, NSIS can be unpacked.

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TUGZip
File archive which can pack the formats 7-ZIP, BH, BZ2, CAB, JAR, LHA (LZH), SQX, TAR, TGZ, YZ1, ZIP.
ZIP, 7-ZIP, A, ACE, ARC, ARJ, BH, BZ2, CAB, CPIO, DEB, GCA, GZ, IMP, JAR, LHA (LZH), LIB, RAR, RPM, SQX, TAR, TGZ, TBZ, TAZ, YZ1, ZOO are supported to be unpacked.
More over the disc image formats BIN, C2D, IMG, ISO and NRG can be read und extracted.

ArcConvert
Converts files coded with old or uncommon compression formats to common formats.

Virtual CloneDrive
CD/DVD-Emulator which enables to mount ISO-Images as logical drive.

MagicDisc
CD/DVD-Emulator which enables to mount ISO-Images as logical drive. Almost all CD/DVD image can be accessed to use games, music or software programs without the need of an optical drive.

DAEMON Tools Lite
CD/DVD-Emulator which enables to mount ISO-Images as logical drive. Almost all CD/DVD image can be accessed to use games, music or software programs without the need of an optical drive. Next to an GUI a commandline interface can be used.

InfraRecorder
InfraRecorder is a free CD/DVD burning solution for Microsoft Windows.