The United Nations is a great resource site for research on country specific topics.
You can use it you are researching any group of countries for a particular policy comparison or product estimation .
You can click on the Country Profile link on the left.
A simple querying tool allows you specific country profiles along parameters.
Eg. India’s economy-
The site requires you to acknolwedge credits and commercial usage
needs special permission. But it remains the most comprehensive and neutral sources of economic data.
A drawback is sometimes data is not updated for latest years.
The solution to that is individual statistics department of government. Historic time series are best used during this tool.