World Development Indicators (WDI) Online is the World Bank's compilation of data. Provides direct access to more than 800 development indicators for 208 countries with time series data from 1960 to the present.
Foreign aid from the United States: Data and Tools. Information gathered includes international food assistance programs, health surveys and “dollars to results” data for foreign aid to dozens of countries
Data collected by U.S. Commercial Service for promoting U.S. good abroad. Search for countries under Opportunities Tab; other resources include industry market reports, guides and statistics and events.