I built sm³, inspired by sm2, to manage multiple Syncthing instances from one dashboard: shared-folder maps, drag-and-drop sharing, file activity, configuration, and bulk actions.
Run it with Docker:
docker run -d --name sm3 -p 8080:8080 -v sm3-data:/data \
-e SM3_PASSWORD='choose-a-strong-password' jangita/sm3:latest
Or add it to your Docker Compose stack. Examples are in the README.
Open http://localhost:8080, sign in, and add your Syncthing servers using their addresses and API keys.
Code and instructions: GitHub - jangita/sm3 · GitHub
Thanks to Syncthing and sm2! Give it a try. Feedback and bug reports are welcome.