When I started using Ubuntu Touch, I started developing a document scanner app called Camera Scanner out of curiosity. It turned out I am much more interested into the tooling than app development itself. Many features I contributed to Clickable were inspired by my work on this app while the Camera Scanner only made some progress thanks to contributions from friends (Stefan, Krille, Cibersheep). It reached a state where it kind of works, but not very reliably and with little feedback to the user, making the user experience rather frustrating.
I would love if somebody would be motivated to put love into the Camera Scanner App to make it the great app it could be. If someone would want to "only" take care of the frontend, I'd still be available to put some more work into the backend.
The backend is mostly a C++ reimplementation of the Open Note Scanner backend (written in Java), but less configurable (yet). It makes use of OpenCV for image processing.