World DataBank: World Bank’s Open Data Initiative

Offers open and free access to over 2,000 financial, business, health, economic, and human development data for more than 200 countries, with the data going back to 50 years. Access to at least 20 World Bank Group databases, including World Development Indicators, Global Development Finance, Global Economic Monitor, Actionable Governance Indicators, Doing Business Database, Health, Nutrition, and Population Statistics.