The Commonwealth of Massachusetts in the USA offers a broad GIS Accessibility Guide on their website. The guide provides numerous recommendations and links to resources around accessibility for GIS and GIS products such as web maps, storymaps, and PDF or paper maps. It features seven parts:
- Building accessible GIS products: Background and general considerations and recommendations
- GIS accessibility guidance: web maps: Resources on basemap selection, layers, symbology, pop-up windows, labels, legends, web map item details, text, and more
- GIS accessibility guidance: static maps from ArcGIS Pro: ditto, plus testing for accessibility, creating accessible PDFs and more
- GIS accessibility guidance: StoryMaps: ditto, plus alt text, embedded content, alternative data formats and more
- Esri bug and enhancement list: Collection of enhancements and bugs submitted to Esri with timeline and status information
- GIS accessibility resources: Links to other resources
- GIS accessibility contact form: Primarily intended for Massachusetts state employees, I imagine
You can see that the guide is geared towards users of Esri products, but it is in no way limited to that user group. It features plenty of general good advice. I like the transparency and accountability aspect of what Massachusetts is doing by submitting issues to Esri and maintaining a public list of what happens to bug reports and enhancement requests.