DiffMerge from Sourcegear is a cross-platform application for comparison and merging files in Windows, UNIX and Mac OS.
The latest version of DiffMerge is 3.2.0. As you can see interface of the program is very simple and there are no difficulties should occurs even you are inexperienced user of such programs.

All required buttons you can find in the main window:
• Open Folder Window – help you compare content of two directories and find missing or identical files.
• Open Diff Window - help you easily compare two files and highlight differences between them. After comparison all information will be available for editing.
• Open Merge Window – shows the changes between three files and can help to merge them in one resulting.
Besides main features DiffMerge is very configurable for advanced users. There are many rulesets and options that can extend functionality of the program. There are some rulesets are present that helps to make easier comparison source code of the most distributed programming languages, UTF-8 and XML files. You can make your own rulesets or edit existed. Rulesets can be changed any time from main menu, so you can make comparison with

different rulesets and choose the most suitable for you.

All changed that you made can be saved to file or printed.
After installing DiffMerge integrate with Windows Explorer make comparison is very easy - right-click on the required files and choose action in context menu.
The program is available for Windows, UNIX and Mac users. I tested Windows version and can tell that this is very fast and stable program that easily compared rather big files without any issues.
One of the most important things in any program is price. DiffMerge offer you very attractive proposition – FREE for full functional progma without any limitations.