Madrid Open Data (datos.madrid.es) publishes 673 open datasets for Spain. Browse them live in Vizzie and turn any one into a map or chart.
Madrid Open Data (datos.madrid.es) is the open-data portal for Spain, covering Community of Madrid. It runs on CKAN, an open catalogue standard used by many national governments. You can browse it directly at datos.madrid.es.
On Madrid Open Data (datos.madrid.es), most datasets here are clearly licensed — only a small share are undeclared. 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 642 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.