- Annual Report to Congress on Foreign Industrial Espionage (1)
- C4I.org
 - Computer security and intelligence resources. - Centre for Counterintelligence and Security Studies
- Non-governmental centre committed to excellence in counterintelligence and security education, analysis, and leadership.
- Cryptome
- Hosts essays, articles, and the text of legislation that covers cryptology, dual-use technologies, national security, and intelligence.
- Echelon Network (8)
- Intelligence and CounterIntelligence
- With information on military intelligence, paramilitary, terrorism, commercial and industrial espionage.
- Intelligence Network, The (Intellnet)
- Aggregates news and documents from around the world.
- Interception Capabilities 2000
- EU study that considers the state of the art in Communications intelligence (Comint) of automated processing for intelligence purposes of intercepted broadband multi-language leased or common carrier systems, and its applicability to Comint targeting and selection, including speech recognition.
 Internal Security Department (ISD)
- Counters security threats to Singapore's internal stability and sovereignty.- Interpol (6)
- Discover Interpol (or International Criminal Police Organisation), the intelligence agency which assists international criminal police co-operation. Sites include background information, core functions, international liaison, regional activities, recruitment details, and the subsidiary groups of the world's third largest international organisation.
- Literature of Intelligence: A Bibliography of Materials
- Includes materials on wartime intelligence, spy cases, terrorism, covert activities, and more.
- Spies Cafe
- Espionage news and resources.
- Spylopedia
- Collection of intelligence-related web sites, as well as espionage news and links.
- WHY SPY? The Uses and Misuses of Intelligence
- From Cato Policy Analysis.
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