I have found the following site, documenta omnia catholica, in which one can find, as probably already guessed :-p, works from christian authors, but, besides them, many others, like pagans, heretics, and others genres, whose works are referred to, or are, according to the responsibles for the site, important for comprehension of the formers’.
I just thought you could benefit, or be interested in it, as most of this works are not avaible at the sites which previously were presented here, like the latin library and bibliotheca augustana, neitheri I found it in other threads of this board.
http://www.documenta-catholica.eu/
ps: besides the latin and greek works, there are some translations into portuguese, spanish, french, italian, english and many others.
EDIT: new url http://www.documentacatholicaomnia.eu/