WinDiff is not available for Linux but there are a few alternatives that runs on Linux with similar functionality. The best Linux alternative is Beyond Compare. It's not free, so if you're looking for a free alternative, you could try GNU Diff Utilities. If that doesn't suit you, our users have ranked more than 10 alternatives to WinDiff and three of them are available for Linux so hopefully you can find a suitable replacement.
Beyond Compare allows you to compare files and folders. By using simple, powerful commands you can focus on the differences you're interested in and ignore those you're not. You can then merge the changes, synchronize your files, and generate reports for your records.
Beyond Compare vs WinDiff opinions
pros, cons and recent comments
Intuitive interface many options for looking at the data such that it makes sense to the end user, easy to determine the next step for the user based on their initial objective. I love the drag and drop from either side to the other and the way it displays the status of the job in real time.