TODO: Not all of the following are tools, most are simply company names. The tools should have their own articles...

Hardware imagers

Data Compass

A hardware and software tool by SalvationDATA that can image data from bad sectors, unstable heads and other drives.

DeepSpar Disk Imager

Handles Data Recovery Imaging issues, drive instability, and bad sectors. http://www.deepspar.com/products-ds-disk-imager.html - Data Sheet and Whitepaper available for download from product web page.

ICS Solo3

Supports USB, Firewire and SCSI drives. http://www.icsforensic.com/

Logicube Talon

Supports USB

PSIClone

Built-in PATA, SATA, USB and write blocker. http://www.thepsiclone.com/

Enhanced Error Handling and Logging

Voom HardCopy III

Allows destination drive to be formatted in NTFS.

Unix-based imagers

ewfacquire, ewfacquirestream

The tools ewfacquire and ewfacquiresteam are part of the libewf library package. They can create evidence files in the EnCase and FTK Imager .E0* (EWF-E01) and SMART .s0* (EWF-S01) formats. ewfacquire is intended to read from devices and ewfacquirestream from pipes. Both tools calculate an MD5 hash on default while the data is being acquired. They are able to calculate a SHA1 message digest as well, but because of compatibility with EnCase they only store the SHA1 hash in the Extended EWF (EWF-X) format. ewfacquire and ewfacquirestream provide support for byte swapping of media bytes. This is useful for dealing with big endian media on and little endian architectures and vice versa. It also has intelligent error recovery.

http://code.google.com/p/libewf/

Adepto

http://www.e-fense.com/helix/

aimage

Part of the AFF system, aimage can create files is raw, AFF, AFD, or AFM formats. AFF and AFD formats can be compressed or uncompressed. aimage can optionally compress and calculate MD5 or SHA-1 hash residues while the data is being copied. It has intelligent error recovery, similar to what is in ddrescue.

AIR

AIR (Automated Image and Restore) is a GUI front-end to dd/dcfldd designed for easily creating forensic bit images.

http://air-imager.sourceforge.net/

dcfldd

A version of dd created by the Digital Computer Forensics Laboratory. dcfldd is an enhanced version of GNU dd with features useful for forensics and security, such as calculating MD5 or SHA-1 hashes on the fly and faster disk wiping.

dd

A program that converts and copies files, is one of the oldest Unix programs. I can copy data from any Unix "file" (including a raw partition) to any other Unix "file" (including a disk file or a raw partition). This is one of the oldest of the imaging tools, and produces raw image files. Extended into dcfldd.

EnCase LinEn

Linux-based version of EnCase's forensic imaging tool.

GNU ddrescue

http://www.gnu.org/software/ddrescue/ddrescue.html

dd_rescue

http://www.garloff.de/kurt/linux/ddrescue/

A tool similar to dd, but unlike dd it will continue reading the next sector, if it stumbles over bad sectors it cannot read.

iLook IXimager

The primary imaging tool for iLook. It is Linux based and produces compressed authenticatable image files that may only be read in the iLook analysis tool.

MacQuisition Boot CD

Provides software to safely image Macintosh drives.

rdd

http://sourceforge.net/projects/rdd

Rdd is robust with respect to read errors and incorporates several other functions: MD5 and SHA-1 hashing, block hashing, entropy computation, checksumming, network transfer, and output splitting.

sdd

Another dd-like tool. It is supposed to be faster in certain situations.

Windows-based imagers

AccessData

Their ultimate tool lets you "READ, ACQUIRE, DECRYPT, ANALYZE and REPORT (R.A.D.A.R.)."

ASR

A tool for imaging and analyzing disks.

DIBS

Can image and convert many file formats. Also builds mobile toolkit.

EnCase

Can image with out dongle plugged in. Only images to E0* file.

FTK Imager by AccessData

Can image and convert many image formats. Including E0* (EWF-E01), s0* (EWF-S01) and dd. Also a free tool.

Ghost

FTK can read forensic, uncompressed Ghost images.

iLook

The IRS's set of forensic tools and utilities. iLook V8 can image in Windows.

Paraben

A complete set of tools for Windows (and handheld) products.

ProDiscovery

Images and searches FAT12, FAT16, FAT32 and all NTFS files.

X-Ways Forensics

Has some limited imaging capabilities. The output is raw format.

X-Ways Replica

Performs hard disk cloning and imaging. The output is raw format.