None are current AFAIK. I do think that the downsides of P2P could be largely offset by assuming a raspberry Pi or equivalent small system to offset the batter

None are current AFAIK. I do think that the downsides of P2P could be largely offset by assuming a raspberry Pi or equivalent small system to offset the battery, bandwidth, and CPU penalties that are so hard to justify on Mobile. So they are of historical interest only, but if you want to did up the history I'll give you some search terms. Marvell had a $99 reference platform called the SheevaPlug CloudEngine had a Pogoplug, CTera had a CloudPLug, Seagate DockStar, GuruPlug, DreamPlug, PylonPlug, sipJack, GeNiJack, etc. etc. etc. They all had a GHz or so CPU, GigE, 512MB ram, etc.