This list is predominantly made for students (especially undergraduate students) of economics who may want to learn how to play around with economic data or those who may be in the stage of writing undergraduate thesis. The list maybe also useful for early stage researchers in economics and public policy.
I add a special section on Indonesian data as I found how little knowledge on Indonesian economy that people in general have despite how large (4th biggest population in the world, one of the biggest democracy, one out of very few that was able to maintain positive economic growth in the peak of 2008 crisis, second biggest rain forest stock, etc) and potential the country actually is.
So, here are some economic databases that may be of your interest:
Data on International Trade:
This database includes export and import data and tariff data. You can choose which source and destination countries you want. You can also choose which product-level aggregation you want, both in HS and SITC. The link above is directed to the one that allows you to do advanced query (which I like). You may need to register first to get the access. But it's super fast and you only need to register once. For a simpler version with data visualization tool, please refer to here.
This database provides trade data in tables, graphs, and maps. So it's very useful to make some infographics. The goods classification is (I believe) in HS classification, so not SITC.
This database include a more summarized data usually, but has some specific data like Global Value Chains data (linked to the OECD Trade in Value Added data), trade in services, and Non-Tariff Measures data, etc. You may want to check out its country profiles as well to get compact and comprehensive overview of any WTO member trade performance and trade policy.
Finally a world input-output matrix that can allow one to see trade flows in terms of value-added!
Data on General Economic Measures
This database gives you various kinds of real GDP series across countries overtime. You can use different measurement of real GDP that is consistent for different purposes such as when you want to compare living standard across countries overtime or instead productive capacity across countries overtime.
You name it! All kinds of measures of development.
A measure of development, incorporating several welfare indicators, across countries. Constructed by UNDP.
This database nests WDI, education statistics, gender statistics, health nutrition and population statistics, etc.
Economic History Database
This database gives you cross-country comparison of income per capita over a long time horizon (very very long, for some country or area, dated back in year 1).
This database provides main macroeconomics measures for 17 advanced countries, in annual series from 1870. If you use stata, you can also directly open the data by just using this command (need internet connection): use http://macrohistory.net/JST/JSTdatasetR2.dta
Macroeconomic measures such as nominal and real GDP, exports, imports, exchange rates, interest rates, government revenues, government expenditure, public debt, asset prices including house prices and stock prices, to even crises dates. Check out the link for complete list and description.
Data on Indonesian Economy