http://www.comw.org/rma Project on Defense Alternatives, Revolution on Military Affairs (RMA)—maintained by the Commonwealth Institute, Cambridge, MA. This website provides access to papers and other works dealing with terrorism, including some papers (from conferences or as working papers) that are not readily available elsewhere.

http://www.start.umd.edu/gtd/ National Consortium for the Study of Terrorism and Responses to Terrorism (START), Global Terrorism Database. This database contains information on incidents and casualties by country, region, type of attack, and group from the 1970s forward. This database is a continuation of materials that were first collected at St Andrews and then incorporated into the National Memorial Institute for the Prevention of Terrorism. It is the best source for such information.

https://www.rand.org/nsrd/projects/terrorism-incidents.html   The RAND Database World Terrorism Incident Database precedes the Global Terrorism Database.  It contains information on international incidents from 1968 to 1997 and international and domestic incidents from 1998 to 2009.  The data and search possibilities can be used to supplement the information in the Global Terrorism Database for these years.

https://www.datagraver.com/tags/terrorisme This website provides a good summary of terrorism trends. It derives its information from some of the other sources noted here, but it does provide a useful site for quick reference.

http://www.nctc.gov/ This is the website of the National Counterterrorism Center (NCTC). This centre took over incident reports from the State Department and has published a number of annual reports in recent years with useful data. The volumes for individual years are more readily accessed with a search engine with the search term ‘Reports on Incidents of Terrorism’.