Database of metadata and, when available, links to images of "texts from the ancient world, particularly late period Egypt and the Nile valley (roughly BC 800 and 800 AD).” Important subsets can be searched at the following links:
"The online BP provides access to all the entries published by Marcel Hombert and his successors from the origins of the BP, in 1932, until the last issue of the past year."
"A ready bibliography of all monographic volumes, both current and out-of-print, of Greek, Latin, Demotic and Coptic documentary texts on papyrus, parchment, ostraca or wood tablets."
Online table of contents for all Oxyrhynchus volumes and digital images of the papyri from v. 15 on. Basic metadata but no transcriptions. See the Location lists for locating the papyri of the early volumes (1-18). Also, see here for the images of three other important Oxford collections: P. Ant., P. Herc. and Suppl. Mag.