Ant Renamer

Ant Renamer is a free program with publicly available source code, specializing in renaming large groups of files and folders using customizable rules. Its development began in 2003, and it is still supported today to maintain compatibility with modern operating systems. However, potential users should note that it is built on an older framework and lacks integration with newer Windows functionalities. Despite this, its core strength—efficient batch renaming with Unicode support—makes it a valuable utility for basic organizational tasks without any cost.