gPhoto is a program and library framework that lets users download pictures from their digital cameras. The libgphoto2 library gives you access to hundreds of models of digital cameras on several platforms.
GIT repo and Issue tracker lives at https://github.com/gphoto/ these days.
This project is about writing a Linux SANE backend for the USB color scanners HP3300c, HP3400c, HP4300c, Agfa SnapScan Touch and Trust Office Scan 19200