I've been working on G-Scope, a free application for digital microscopes, available for Windows, macOS, Linux and Android.
Most USB microscopes come with poor software, often limited to one brand or operating system. G-Scope works with almost any UVC microscope and several Wi-Fi models too, it has photo/video capture, calibrated measurements, annotations, and more advanced features like panorama stitching and PDF reports. Some pro features require a one-time purchase.
Everything is local, without account, no subscription, cloud or telemetry.