GPRename is a complete batch renamer for files and directories and is licensed under the terms of the GNU General Public Licence version 3.
GPRename is a computer program for renaming multiple files and directories at one time. GPRename is written in Perl, and runs on any Unix-like operating system.
Rename both files and directories Case change: to UPPERCASE, to lowercase or Only The First Letter Insert or delete text at a position Replace text with the options of case sensitive or regular expression Rename with numbers (001.jpg, 002.jpg, 003.jpg...) Automatically trim double spaces to one space, also trim leading and/or trailing spaces around the name Multilingual : Brazilian Portuguese, Catalan, Dutch, Dutch, English, French, Indonesian, Italian, Polish, Spanish.
It is very simple and does the job perfectly. Unfortunately it is not working properly on my computer, I have no idea why.
I may try to get in contact with the team, but I have little hope in they feedback, since the last update is from 2015.