WinHex is a hexadecimal editor for Windows 95/98/Me/NT/2000/XP with a lot of features:

* Disk editor (logical & physical, supports FAT16, FAT32, NTFS, and CDFS)
* RAM editor - a means to edit other processes' virtual memory
* Data Interpreter, knowing 19 data types
* Editing data structures using templates
* Concatenating, splitting, unifying, analyzing, and comparing files
* Particularly flexible search and replace functions
* Automation of file editing
* Sophisticated undo mechanism
* Drive imaging & drive cloning
* 128-bit encryption, MD5, 256-bit digests, CRC32, checksums
* Import of all clipboard formats
* Conversion formats: Binary, Hex ASCII, Intel-Hex, and Motorola-S
* Printing
* Deleting files irreversibly (e.g. such with confidential contents)
* Instant window switching
* Random-number generator
* Complete online help and much more

WinHex has minimal system requirements, operates very fast, needs little memory and is easy to use. An excellent computer forensics tool.