L.E.I.C.A. (Long Exposure Internet CAmera) is an application that takes input from your webcam, or v4l2 device, and makes a long-exposure image.
Until now there's only a python binding for this app, soon there will be a C/C++ SDL one
HDRFlow is a framework to process high-dynamic range (HDR) and RAW images. It's written in C++, and is both cross-platform and hardware accelerated on modern GPUs.
Photo Kiosk software suited for Mini-labs.Has intuitively simple and singular interface. Need a regular PC to run and can be fully customized (logos, appearance, languages, etc) for photo shop own style.