WinMerge è uno strumento Open Source per confrontare il contenuto di files ed eventualmente unirne i cambiamenti. Le sue funzioni:

• Visual differencing and merging of text files
• Flexible editor with syntax highlighting
• Handles DOS, UNIX and MAC text file formats
• Unicode support
• Difference pane shows current difference in two vertical panes
• Location pane shows map of files compared
• Highlights differences inside lines
• File filters in directory diff
• Moved lines detection in file compare
• Shell Integration
• Rudimentary Visual SourceSafe and Rational ClearCase integration
• Archive file support using 7-zip
• Plugins
• Localizable interface via resource DLL

Disponibili il manuale online (in Inglese) e lo storico del programma.
WinMerge è standalone: non necessita di installazione.