Vienna based Dare to be Creative today announced the release of Renamer 4.0, an update to its batch file renaming application for Mac OS X. The new Renamer combines a fresh, modern look with powerful renaming options such as chains and a system menu plugin. Features include search and replace, insert, overwrite and remove characters from filenames, number files, convert between upper, lower and mixed case, group renaming tasks, as well as randomly rename files.