Data.gov.sg is the Singapore government's open data portal, known for clean presentation, good documentation, and developer-friendly APIs. It publishes datasets across themes including planning boundaries, transport, environment, and the economy.
Geospatial datasets are commonly offered in GeoJSON and KML and licensed under the Singapore Open Data Licence, free for reuse. For richer base mapping and location services, it is complemented by OneMap, Singapore's authoritative national map platform.