It's a shame that it requires a business email just to try it out. My work doesn't have anything to do with city building but I'd love to use this to create a 3D model of my home town for my own fun.
https://github.com/domlysz/BlenderGIS https://github.com/eliemichel/MapsModelsImporter
The workflow is take a couple hundred overlapping pictures, compute a model using an existing backend and store the image/3d data. Rinse and repeat. When you have a few neighbouring projects, we recompute submodels at the boundary and merge the involved 3d models by reprojection.
Currently wrangling some issues around packaging, a BSD licensed functional prototype should be out sometime next week. I'd love to get some users or eyes on it, do get in touch!
Just register a cheap domain name and point its DNS records at a free email provider (or setup an incoming mail server... outgoing with getting labeled spam is the hard part anyways)