Brice C. Jones
A blog on Early Christianity, focusing on papyrology and manuscripts. His website also has links to collections of papyri on the web.
April Deconick’s blog on early Christianity, apocrypha, and Gnosticism (formerly The Forbidden Gospels).
A good introduction to Islamic mysticism.
Frequently updated blog on Judaism in antiquity by James R. Davila.
Very thorough blog on Greco-Roman material, Biblical resources, and online tech for Classicists.
THE Coptology blog.
Loads of digital resources for the study of Late Antiquity, with more detailed introductions than provided here.