gPhoto2 is a free, redistributable, ready to use set of digital camera software applications for Unix-like systems, written by a whole team of dedicated volunteers around the world. It supports more than 2500 cameras
gPhoto2 runs on a large range of UNIX-like operating system, including Linux, FreeBSD, NetBSD, MacOS X, etc. gPhoto is provided by major Linux distributions like Debian GNU/Linux, Ubuntu, Gentoo, Fedora, openSUSE, Mandriva, etc.
libgphoto2 is freely available and distributed under the terms of the GNU LGPL.; the other gphoto programs are freely available and distributed under the terms of the GNU GPL.
Newer libgphoto2 versions also support Media Transfer Protocol (MTP) based media players since their communications protocol is based on the Picture Transfer Protocol (PTP).