(There's no video for Rename yet. Please contribute to MR and add a video now!)
Uploading my own app, me getting old :)
This app was a quite popular renaming app for Mac OS X and published between 2010 and 2013. The up to date successor is called Rename X and is currently available at the Mac App Store.
rename.dmg (5.46 MiB / 5.73 MB)
/ DMG image
Emulating this? It should run fine under: QEMU