International organizations, such as the United Nations and the World Bank, can be excellent sources of free economic and development data.
Organisation for Economic Cooperation and Development (OECD) Country statistical profiles
OECD collects data on its member countries. Some data is only available for a fee, but some is free. The country statistical profiles include a wide range of indicators on economy, education, energy, environment, foreign aid, health, information and communication, labour, migration, R&D, trade and society.
United Nations Data
Search and download a variety of statistical resources from the United Nations. Datasets include the Commodity Trade Statistics Database, the Demographics Statistics Database, and the Environmental Statistics Database.
World Bank Data
World Bank provides collections of time series data on a variety of topics. You can create your own queries; generate tables, charts, and maps; and easily save, embed, and share them. Databases include world development indicators, education statistics, and health statistics.