Kimmo Varis

WinMerge is a tool for visual difference display and merging, for both files and directories. It is highly useful for determing what has changed between file versions, and then merging those changes. WinMerge has Unicode support, Flexible syntax coloring editor, Visual SourceSafe integration, and ... [More] Windows Shell integration. Regexp filtering for filenames and lines. Side-by-side line difference and highlights differences inside lines. A file map shows the overall file differences in a location pane. The user interface is translated into several languages. [Less]

Frhed is an binary file editor for Windows. It is small but has many advanced features like ability to load big files partially.