Active File Compare 

Active File Compare is an advanced utility for the comparison and synchronization of any text files in visual mode. Use this tool to compare two versions of the same file or to correct the source code versions.
file compare text utility tool merge visual difference management source code synchronization directory folder

Compare It! 

Powerful file compare and merge utility. Features: build-in editor with syntax highlighting, undo and wordwrap; highlights changes within lines; editing or fast by-difference merging; printing; html and text reports; zip support; Unicode support.
file merge compare comparison merge.

Beyond Compare 

Beyond Compare is a Windows utility that combines directory compare and file compare functions in one package. Use it to manage source code, keep directories in sync, compare program output, etc.
beyond compare file folder directory synchronization comparison merge diff side-by-side

Cygnus Hex Editor 

This is the fastest and easiest hex editor available anywhere! Tabbed MDI interface, multi-level undo & redo, extensive drag & drop support, blazing search/search & replace, file comparison, delete and insert characters like a word processor, more.
hex editor binary

AJC Directory Synchronizer 

AJC Directory Synchronizer makes it easy to synchronize files and compare folders between any two locations. Synchronize large numbers of files between computers, sync laptop to desktop, mirror to backup drive, sync mp3 player etc.
directory folder file compare synchronise synchronize diff compare folders compare directories compare files synchronize folders synchronize directories laptop desktop

HexCmp 

HexCmp is a program, which combines together the features of a binary file comparison application and a convenient hex editor. The program will help you to compare files in binary format, at the same time serving as a hex editor that will edit files.
binary file compare hex file compare hex compare binary edit editor hex binary hexcmp raw viewer fairdell