The Early Church Fathers is a 38-volume collection of writings from the first 800 years of the Church. This collection is divided into three series, Ante-Nicene (ANF), Nicene and Post-Nicene Series I (NPNF1), and Nicene and Post-Nicene Series II (NPNF2).
These files have the majority of the text printed in the actual books, but the indexes are not included. In fact, Volume IX of the Ante-Nicene Series, which consists entirely of index information, is not available. [Adapted from the introduction to the Electronic Bible Society CD-ROM Volume 1, the source of the text files for the original Early Church Fathers page.]
In these files you will see Greek and Hebrew text transliterated into the Roman alphabet. To see the Greek and Hebrew in their own alphabets, you should install two public-domain fonts: SPTiberian and SPIonic. (In Windows 95, just copy them to your windows\fonts directory.) You can download these fonts for Mac or Windows from this server.