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.
...The app was written to have only important features and not those that will distract you. Advanced users may perform screenshot tasks in an automated manner using the cmd line interface.
Requires: .NET Framework 4.5