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gPhoto is a free software package of digital camera applications with support for more than 600 cameras. It is available under the GNU General Public License. gPhoto runs on GNU/Linux, FreeBSD, NetBSD and other Unix-like operating systems.
gPhoto has support for the Picture Transfer Protocol.
Many cameras are not supported by gPhoto, but have support for the USB storage protocol, which is well-supported under GNU/Linux.
gPhoto provides a command line interface and its design allows for other frontends to be written for it. gtkam is the official GUI client for gPhoto, other clients are the KDE program digikam and the Mono based f-spot.
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