SCP (simple concordance program) is a concordance and word listing program that is able to read texts written in many languages and WAS available free. There are built-in alphabets for English, French, German, Greek, Russian, etc.
I have used SCP to generate wordlists in text format to create indexes for my books.
However, most download links on the web are no longer working. If you have difficulty downloading the program from above site, try the only link I know that is working (4.63 Mb):
http://www.tyndale.cam.ac.uk/Download/SCP32x40.exe