Here is the announcement by one of the developers, Rodney Ast of the Unveristy of Heidelberg:
We are pleased to announce the launch of PapPal (www.pappal.info), an online resource for the study of ancient paleography. The site currently gathers thumbnail images of over 2500 dated Greek documentary papyri from collections around the world, which can be displayed either in gallery or slideshow mode. Links direct users to full images and further information at the host sites and to metadata and transcriptions at papyri.info. At the moment, there are only a handful of ostraka included. In the coming months we will be adding more of them, as well as dated Latin documents. I hope that you will take some time to explore the site and send me your comments.
Work on this project has been made possible by the Deutsche Forschungsgemeinschaft in the context of the University of Heidelberg's Cultural Research Center 933. Material Text Cultures: Materiality and the Presence of Writing in Non-Typographic Societies, with further support from the Institute for Papyrology.