insigne
A Node command line utility for mass file renaming, using your preferred text editor.
It works by creating a temporary text file with the names of the files you choose, which it monitors for changes you make to it, renaming the files accordingly.
Installation
With Node installed, type into the command line:
npm install -g insigne
This will install the package globally, so you can access it anywhere.
How to use
In the command line, just pass it a list of filenames.
insigne "file 1.txt" "other file.jpg"
Your OS's default editor for plain text files will open, displaying one filename per line.