Bureau of Industry and Security
Export Portal - US Department of Commerce
International Trade Administration - Information by and about the International Trade Administration, including brief trade statistics by state and metropolitan area as well as import/export figures for countries.
International Trade Centre
National Trade Estimate Report on Foreign Trade Barriers - from the office of the US Trade Representative.
Tradeport - International trade, such as trade leads, market and industry research, trade shows, exporting, etc.
TradeStats Express - Latest annual trade data.
Trade Data Overview - from Duke University
UN Commodity Trade Statistics Database
UNCTAD TRAINS - is a comprehensive computerized information system at the HS-based tariff line level covering tariff, para-tariff and non-tariff measures as well as import flows by origin for more than 140 countries
USITC Trade Database - data on tariffs and trade from the United States International Trade Commission.