A versatile statistical software:
R Core Team (2018). R: A language and environment for statistical computing. http://www.R-project.org/.
Terrorism database with worldwide coverage:
The Global Terrorism Database (GTD). START (2017). http://www.start.umd.edu/gtd/.
Conflict events database:
ACLED: Raleigh, C., Linke, A., Hegre, H., & Karlsen, J. (2010). Introducing ACLED: An armed conflict location and event dataset special data feature. Journal of peace Research, 47(5), 651-660.
Spatial regular polygons and associated data:
PRIO-GRID: Tollefsen, A. F., Strand, H., & Buhaug, H. (2012). PRIO-GRID: A unified spatial data structure. Journal of Peace Research, 49(2), 363-374
World map and associated data:
Natural earth data. http://www.naturalearthdata.com/