Tamil Nadu Open Data publishes 19,580 open datasets for India. Browse them live in Vizzie and turn any one into a map or chart.
Tamil Nadu Open Data is the open-data portal for India, covering Tamil Nadu. It runs on data.gov.in (DMS), an open-data platform. You can browse it directly at tn.data.gov.in.
Licences here are declared per dataset via GODL-India. A machine-readable summary of the licence mix isn't available yet, but Vizzie surfaces each dataset's declared licence (or notes when none is given) as you browse — remember that an undeclared licence is not the same as public-domain or free-to-use, so check before you reuse.
No download, no GIS specialist. Opens in Vizzie.