The Uppsala Conflict Data Program (UCDP) is the world’s main provider of data on organized violence and the oldest ongoing data collection project for civil war, with a history of almost 40 years.
The Inter-University Consortium for Political and Social Research maintains a data archive of research in social sciences, with 63 studies conducted covering conflict, aggression, violence and/or war. The collection is broken down into two subcollections: Conflict and Stability within Nations and Conflict Between and Among Nations.
The Correlates of War project includes quantitative data on topics within international relations including trade, religion, alliances, militarization, colonialism, and conflict.
The Stockholm International Peace Research Institute maintains four databases on arms transfers, military expenditures, peace operations, and the arms industry.
"Global dataset that describes, in quantitative terms, the deliberate killing of non-combatant civilians in the context of a wider political conflict." Coverage 1995-2020.
