Chaps, take a look at
http://fanfictionloader.appspot.com — it supports all the same as FLAG + FanFicAuthors + FicWad + FictionAlley (almost there), outputs to ePub and HTML and needs no installation. It is powered by open source library
http://code.google.com/p/fanficdownloader/ which of all dependencies needs only Python and nothing else - feel free to use it too.