It doesn't include software, so seemingly ignores the economic activity of some of the largest companies in the US. Does anyone know what's going on there? I guess software isn't visible at customs boarder checks, so isn't included.
The UN has made great efforts to standardize goods data, but AFAIK they don't have services data. This is the data that this website is using: https://comtrade.un.org/.
That said, the Harvard version of The Observatory of Economic Complexity, the Atlas of Economic Complexity (there is an MIT/Harvard rivalry here), includes services data: http://atlas.cid.harvard.edu/explore?country=231&product=und....
From the Atlas's website: "The raw trade data on goods are derived from countries’ reporting to the United Nations Statistical Division (COMTRADE). The trade data on services are from the International Monetary Fund (IMF) Direction of Trade Statistics database, via the World Development Indicators."