Some of the commonly used sources for macroeconomic data are the following:

1) FRED (Federal Reserve Economic Data): this is the macroeconomic database maintained by the Federal Reserve Bank of St. Loius. It provides macroeconomic data that covers the following major categories: 1) Money, Banking, & Finance; 2) Population, Employment, & Labor Markets; 3) National Accounts; 4) Production & Business Activity; 4) Prices; 5) International Data and 6) U.S. regional data.

2) World Development Indicators (WDI): this database is maintained by the World Bank, covers a broader set of countries than FRED. In this database, you can find major macroeconomic variable such as output, prices, employment, productivity and trade for most countries in the world.