gphoto2

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).