DiffMerge is great! There are a couple things that would be nice to be able to do, either I haven't figured out how to yet or they would be great new features.
1. filter directory comparisons by file extension (hide matching or non-matching files)
2. sort directory comparisons by type/file extension
3. when comparing directories, an option to not drill down into subdirectories
4. Ability to change the size of the font/display, or at least have a popup to show the entire path when you hover over the top of the list.

Thanks!

1. In the Tools - Options - Folder Windows - Folder Filters is an area where you can filter out certain file extensions.

2. We don't have the sort ability, but I've added a feature request for that functionality now.

3. I thought we had that. I'm still looking into it.

4. In the Tools - Options - Folder Windows change the Window Font.

If you are using a Mac or Linux machine rather than a Windows machine, let me know. I answered for a Windows machine.

Great! Thanks Beth. I am on a Windows machine most of the time.