zBoy is a multiplatform GameBoy emulator that provides a load/save feature,
can perform PCX screenshots either manually or automatically (every few
seconds) and emulates an internal battery for ROMs that were designed to use
one (this allows to use the internal save option provided by such games,
remember highest scores, etc).
zBoy supports some additional features, too, like intelligent saving of
hi-scores for some games that aren't able to save their hi-scores table by
themselves because of the lack of a battery-backed RAM on the cartridge, and
improving screen's resolution output using graphic algorithms like Scale2x,
It is also one of the very few GameBoy emulators that provides a 2-gameboys
link emulation, which makes it possible to play some games in 2-players mode
on a LAN.