Google Public Data
The Google Public Data Explorer makes large, public-interest datasets easy to explore, visualize and communicate. It provides public data and forecasts from a range of international organizations and academic institutions. Sources include the World Bank, OECD, Eurostat and the University of Denver.
These can be displayed as line graphs, bar graphs, cross sectional plots or on maps
You can search by keyword, to see what data is held on the site, or narrow down and search one particular dataset, or one particular source.