Scroll down to paper: Aid, Policies and Growth, with David Dollar. American Economic Review 90(4), 2000, 847-68 -- Dataset for this paper includes measures for institutional quality, ethnic fractionalization, government consumption of GDP, more.
Macro time series, micro time series, government finance, and social indicators including ethnic fractionalization, party fractionalization, regime changes, and fixed factors. 1960-99. Easterly and Yu.
Links to datasets produced by the CSP to research conflict including Forcibly Displaced Populations, Major Episodes of Political Violence, Political Instability Task Force-State Failure Problem Set, Polity IV, and Coups d'Etats.