Mobility Data Specification (MDS)
MDS standardizes communication and data-sharing between cities and private mobility providers, such as e-scooter and bike-share companies.
The Standard for Public Code - a model for public organizations to build their own open source solutions to enable successful future reuse by and collaboration with similar public organizations in other places.
The Standard for Public Code is a set of criteria that supports public organizations in developing and maintaining software and policy together. It is used by public organizations from municipalities to state level agencies. It is an open standard, licensed CC0, so anyone may use it and adapt it for their needs. It was awarded Digital Public Goods status in 2021. It is maintained by the [Foundation for Public Code](https://directory.civictech.guide/listing/foundation-for-public-code). It is available at <https://standard.publiccode.net/> The GitHub repository: <https://github.com/publiccodenet/standard>

MDS standardizes communication and data-sharing between cities and private mobility providers, such as e-scooter and bike-share companies.

HXL is a different kind of data standard, designed to improve information sharing during a humanitarian crisis without adding extra reporting burdens.

The Digital Public Goods Standard is a set of specifications and guidelines designed to maximise consensus about whether a digital solution conforms to the definition of a digital public good: open-source software, open data, open AI models, open standards, and open content that adhere to privacy and other applicable best practices, do no harm by design and are of high relevance for attainment of the United Nations 2030 Sustainable Development Goals (SDGs).

CityGML is an open data model and XML-based format for the storage and exchange of virtual 3D city models.