1)   KuKnet FileRenamer 2.5
Freeware-Tool to rename files. Features: Replace, Numeration, upper and lower case, insert / delete, regular expressions and many more
filerenamer, kuknet, rename, file, umbennen, datei,

 2)   FilenameToFTP 1.20
renames files and folders for a next-coming FTP-upload that way, that it replaces invalid characters with an underscore "_". German special character as ä, ö, ü, ß will be replaced with "ae", "oe", "ue" and "ss". The filename will be lowercased.
ftp, upload, file, filename, renaming, umbennen, date, umlaute, umlauts, lower,