Priime - Edit photos with the styles of the world's top photographers. Smart suggestions, fast editing, and inspiring collections.
wxWidgets - wxWidgets: Cross-Platform GUI Library
Nizo - A better iPhone camera for shooting film
Electron - Build cross platform desktop apps with web technologies
VSCO Cam - VSCO Cam is an iPhone, iPod Touch, & Android camera app w/ elegant, minimal processing options.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.