SACOG publishes 762 open datasets for United States. Browse them live in Vizzie and turn any one into a map or chart.
SACOG is the open-data portal for United States, covering California. It runs on ArcGIS Hub, Esri's open-data platform for geographic data. You can browse it directly at data.sacog.org.
On SACOG, a majority of datasets here declare no licence at all. It's important to know that "no licence declared" is not the same as public-domain or free-to-use. Undeclared data carries no explicit permission to copy, adapt, or redistribute it — so reusers should treat it cautiously and check with the publisher before relying on it. Vizzie flags each dataset's licence (or its absence) so you can see this before you build.
Of the 183 datasets here whose licence Vizzie can identify, essentially all of them can be used commercially. Attribution is required by almost every open licence — Vizzie writes the attribution line for you when you export or publish.
No download, no GIS specialist. Opens in Vizzie.