WebODM (OpenDroneMap)

A photogrammetry system that turns drone photographs into an orthophoto, an elevation model, a point cloud and a textured 3D model. It lets an engineering office produce an up-to-date survey of a site from a single flight without a cloud service subscription. You can install and run it on a local server for free; the company behind the project also offers managed hosting, but the software itself is fully open.