The Forge team has provided a reference architecture example of a digital twin application using the Forge platform data visualization APIs, complete with some documentation and code samples.
The live web browser based reference architecture will demonstrate the type of applications you can build using the available Forge APIs. You could build your own custom digital twin application customized for your business or industry needs.
Documentation
https://forge.autodesk.com/en/docs/dataviz/v1/developers_guide/quickstart/