This database from the World Bank provides access to some of the best available country-level data on topics such as health, education, demographics, and the economy.
Visualization and data-mapping tool with hundreds of thousands of data indicators and across demography, economy, health, education, religion, crime and more
A portal to websites on international relations. Use the Topics menu at left for links on topics like international development, public health, and human rights.
Find research on peace, security, and the military. In particular, see their Yearbook and various databases for data on military spending, weapons, and security.