Old technology meets new technology

Somewhere in 2021 I obtained a stereoviewer (Holmes) and a box with Keystone (and Underwood) stereographs, this was the start of a nice adventure. When I got the viewer and the cards it was like traveling back in time, in real 3D, it was stunning. I searched the internet to find old camera's by which I could create some of this stereographs myself and found a Revere 33, so now I could make my own analog stereographs, I even got myself a Revere 22 viewer, cleaned it, fixed the bulb etc. Meanwhile, I got some more stereograph and my collection grew, and then I found Stereograph Cards - Library and an idea was born: what if I could just view those images on my iPhone, just using the old Holmes viewer? What I needed was a holder for my iPhone for the viewer. I already had a 3D-printer (an Original Prusa Mini) I had not used for a long time, so I started designing, and so the iPhone 13Pro Max Holder was born. But then I found the viewer got heavy when using for a long period of time, so I designed a Tripod Mount for the viewer, now I could watch those old stereographs while sitting at the kitchen table! While gathering more info on stereography I found out Fuji-film has had a digital camera for taking 3D pictures, so I went on ebay and found myself a nice one. It was amazing, I now could make 3D pictures myself, but viewing was only possible on the camera itself. So again I search the internet and found a Windows application that could convert the MPO file the camera creates to an SBS (side-by-side) picture, but I own a Mac... Time to put my development-skills in place, first start with a command-line application that can read the pictures in the MPO file, stitch them together and output the result. Version 1.0 of MPOSplitter was born But I wanted the CLI-application to do more, so I added extra options to MPOSplitter and by that time I decided to publish the application to the public domain.