I have posted a special section for Early Christian texts more generally. This includes apocryphal works as well as what we used to call "patristics."
For texts, I have PG Migne and PL Migne. For translations, the websites of Christian Classics Ethereal Library (CCEL) and Early Christian Writings. There is also a little link to gospels.net that has a translation to a few extra-canonical gospels.
I didn't notice any high resolution photographs for original manuscripts for this section, but would love to hear of any website that has them.
I will put more up as I find more or as people send links to me.