About

The Digital Twins Wiki is a free, open reference for people who want to understand a place by modelling it: a city, a watershed, a coast, a region. It collects the tools, the data, the practice and the working examples in one place, describes them evenly with sources, and arranges them by the question a person is trying to answer. "Digital twin" is the shorthand; the site covers models and simulations of places in general, from flood and fire models to agent-based city models and the live, sensor-fed twins the phrase strictly means.

It is meant to be useful rather than complete. A guest with a problem should leave with a next step: the use cases split a question into the questions it really is, the guides walk from naming the question to keeping a model alive, and the notable twins, engines and data say what exists, who makes it, how it runs and what in it is open. Every engine, twin and data source carries an open block on the three axes of Open³: source, data and participation, plus whether there is an API, so that what is reusable and what is closed is visible at a glance.

It is a civic good, not a sales site. No vendor is favoured and nothing is ranked by popularity. Every entry names the pages it was written from and the date it was checked. Software agents find and draft material; a person reads the sources before anything is promoted, and until then an entry is marked as a draft. The whole thing is plain text in a public repository, free to read and reuse, and published for machines as well as people: llms.txt, index.json, graph.json, and every entry as markdown.

It was started by Anselm Hook in October 2026, growing out of a survey of the field written the month before, and is maintained in the open. Who this is for states the audience and the aims; What has changed is the dated record of the site. Corrections are the most valuable contribution: if an entry talks over your head, favours a vendor, states something without a source, or leaves you with nowhere to go, say which one.