It's been used by our group during W11 and we found it pretty convenient (especially i, since i didn't need to do any manual map updates of any sorts)
I decided to open source code for all parts of the project, which are server-side service (using Kotlin/Spring Boot backend and JS/Vue.js frontend) and client integration
Features:
- Minimap images are sent automatically from the client
- Automatic zoom level generation
- Live-mode available (you can see online characters moving on the map)
- Ingame markers can also be automatically sent to the client (including quest givers and custom markers)
- Geolocation available for the client
- Metrics and server state can be monitored through the Humio
- Good performance (easily handled ~40 clients sending updates at the same time at the W11 start)
- Cheap maintenance (or even free - can be run inside free-tier t2.micro aws instance)
- Optimal stability (worked nearly the whole W11 (a year) with only few reboots)
- No more manual merges and updates!
Random W11 map part image

Live mode example: https://webm.red/view/FrOT.webm
More details you can find in the github repo: https://github.com/APXEOLOG/hnh-auto-mapper-server
The client integration sample (with Amber client) can be found here: https://github.com/APXEOLOG/amber/pull/1