Perseus does have a nice list of Greek stop words in the Hopper source code, but I was not able to find anything on normalization at first glance. I'll take a closer look, and also at TLG.
By normalization, I basically mean presenting the form out-of-context, but still declined/conjugated. This is the same as the 3rd word column in the MorphGNT if you are familiar. It's the last step before going to the lexical form.