libgphoto2
The libgphoto2 camera access and control library
libgphoto2 is a library that can be used by applications to access various digital cameras. libgphoto2 itself is not a GUI application, as opposed to gphoto. There are GUI frontends for the gphoto2 library, however, such as gtkam for example. libgphoto2 can only talk to cameras the language of those it understands. That is, if you own a camera that speaks a language that isn't published anywhere and nobody has been able to figure out the meaning of the sentences, libgphoto2 cannot communicate...