Mac only: If you need to rename a giant batch of files, changing each one individually is a huge hassle. NameChanger is a solid little tool that gets the job done fast.
NameChanger is dead simple to use—just drag and drop files right onto the app. The Quick Look feature lets you double-check you're renaming the correct file by springing it open in a small window when you hit the space bar. Any files you don't have permissions to change are greyed out so you can't accidentally mess with them.
NameChanger gives you several options for changing file names, including Replace First or Last Occurrence, by date, sequence, or wildcard. As you type the new name you want to use, the file names change in real-time so you can make sure it looks the way you want it to before you commit.
Thanks to the way digital cameras name images, it's easy to accumulate a zillion files with names like 100_358. This is the perfect tool for making sure you can tell at a glance that the last batch of photos you uploaded are from Uncle Bob's birthday party. How else could a batch file name changer make your life easier? Talk about it in the comments.