Clementine Lunar Image Browser 1.5: Interactive picture, based upon data from a spacecraft, that allow to settle the point of view.
Digital Lunar Orbiter Photographic Atlas of the Moon: Digital edition, with all 675 plates. Search by latitude/longitude, by name or by photo number.
Lunar Nearside Directory: Surface photographs from the Lunar Orbiter database and amateur astronemers, cross-referenced to Rukl's Atlas.
Moon Panoramas: Compilation by Mike Constantine of high-resolution Apollo panoramas.