Gospel of Judas and Other Ancient Quasi-Scriptural Manuscripts

If it's news to you that there are ancient Gospels that didn't make it into the Bible, you may also be interested in knowing about these:

The Nag Hammadi Library, which I linked to some time back. It's the largest surviving collection of ancient gnostic writings.

Though their authenticity has been questioned, there survive ancient pagan references to the growing Christian sect in the Roman world. Especially see the purported exchange of correspondence between Pliny the Younger and the emperor Trajan.

There's even a spurious Letter Of Jesus, which was popular in places from the Dark Ages up to the Middle Ages or so. It's a rather scolding exhortation to keep the Sabbath.

A good one-stop source for much of these writings is here, at the Early Christian Writings website.