List of most information sources I follow
=========================================
Matthijs R. Koot, last updated 2015-03-21 (removed Twitter handles; can be seen live at Twitter)

Below is a list of information sources I follow on cybersec, intelligence, 
defense, anonymity, privacy, journalism, science and skepticism. The list 
is not complete but covers the best sources. Of the Twitter accounts, 99% 
is on-topic. The remaining 1% is politics, corporate or off-topic that I 
didn't have the time for to pick 'm out & remove.

Public journals (last updated: 2012-03-09):

Joint Force Quarterly http://www.ndu.edu/press/jointforcequarterly.html
Journal of Homeland Security Affairs http://www.hsaj.org/
Strategic Studies Quarterly http://www.au.af.mil/au/ssq/
National Security Journal http://harvardnsj.org/
International Journal of Critical Infrastructures http://www.inderscience.com/jhome.php?jcode=ijcis
International Journal of Electronic Security and Digital Forensics http://www.inderscience.com/jhome.php?jcode=IJESDF
NATO CCD-CoE http://ccdcoe.org/4.html

Public IRC (last updated: 2012-03-09):

irc.anonops.com:6667
irc.anonops.bz:6667
ipv6.anonops.pro:6697 (SSL)
irc.anonnet.org:6667 (SSL)
chat.wikileaks.org:9999 (SSL)
http://search.mibbit.com/ (e.g. http://search.mibbit.com/Channels/AnonOps)
http://irc.lc/cryto/opbritain
irc.anonops.pro #freeanons / www.freeanons.org

Public mailinglists (last updated: 2012-03-09):

http://lists.randombit.net/mailman/listinfo/cryptography
http://www.chiark.greenend.org.uk/mailman/listinfo/ukcrypto
https://mailman.stanford.edu/mailman/listinfo/drone-list
http://lists.immunitysec.com/mailman/listinfo/dailydave
http://mailman.science.ru.nl/mailman/listinfo/safe-nl
https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-talk
http://lists.links.org/mailman/listinfo/pet
https://www.ietf.org/mailman/listinfo/ietf-privacy
http://librelist.com/browser/remailer/
http://catless.ncl.ac.uk/Risks
http://groups.google.com/group/TSCM-L2006/
http://seclists.org/fulldisclosure/
http://www.securityfocus.com/archive/1

Public newsletters (last updated: 2012-03-09):

http://www.edri.org/edrigram
http://www.fas.org/blog/secrecy/
http://insaonline.org/index.php?id=736
http://defense-update.com/
http://www.asdnews.com/
http://join.stratfor.com/forms/get-free-reports
http://www.computer.org/portal/web/guest/newsletters2
http://mailman.xmission.com/cgi-bin/mailman/listinfo/cipher
http://www.schneier.com/crypto-gram.html
https://www.eff.org/effector
http://internetsociety.org/newsletter
http://www.tilburguniversity.edu/research/institutes-and-research-groups/tilt/news/newsletter/
http://www.privacynieuws.nl/inschrijven-nieuwsbrief/nieuwsbrief-archief.html (Dutch)
http://www.dans.knaw.nl/content/over-dans/archiefbrief (Dutch)
https://www.bof.nl/doe-mee/ (Dutch)

Public subscription magazines (last updated: 2012-03-09):

Fringe Intelligence (Roger Vleugels)
Fringe Spitting (Roger Vleugels)
Cyberthings for Managers (Arno Reuser, see http://www.opensourceintelligence.eu )
http://www.net-security.org/insecuremag.php
http://www.afcea.org/signal/ (paid)
http://www.crows.org/jed/jed.html (paid)
http://www.csicop.org/si/ (paid)
http://www.scientificamerican.com/ (paid)
http://www.groene.nl/ (Dutch, paid)
http://www.recht.nl/archief/ (Dutch)
http://www.om.nl/actueel-0/publicaties/opportuun/ (Dutch)
http://www.defensie.nl/actueel/defensiebladen/ (Dutch)
http://www.edata.nl/ (Dutch)

Public websites (last updated: 2012-03-09):

http://cryptome.org/
http://www.pgpboard.com/
http://www.thispaddedcell.com/
http://doxsters.org/
https://www.wikileaks-forum.com/
http://www.sciencedaily.com/
http://communities.crows.org/
http://www.phibetaiota.net/
http://www.opensourceintelligence.eu
http://demandprogress.org/
http://www.debka.com/
http://www.gao.gov/
http://www.fas.org/
http://www.h-net.org/~intel/  (H-Intel group)
https://www.pleio.nl/ (Dutch)

Public and non-public LinkedIn groups (last updated: 2012-03-09):

AFCEA International
AFCEA NL Chapter
Advanced Business Analytics, Data Mining and Predictive Modeling
Argumentation Theory
Association of Old Crows
Aurora Cyberconflict Research Group
Bits of Freedom (Dutch)
Black Hat
C4I / SIGINT / Radio Communication
CAcert Community
CRYPTO
CSFI-CWD (CYBER WARFARE DIVISION)
CYBER SECURITY Forum Initiative - CSFI
Computer Science - University of Amsterdam
Cyber Intelligence Network
Cyber Security Summit 2012 - International Cyber Security Thought Leadership
Cyberwar & Cybercrime | Intelligence group
Cyberwarfare Intelligence
Defence & Security Analysts Network
Dutch Cyber Warfare Community
Dutch Intelligence Watch Specialists
Electronic Attack Warriors
Electronic Frontier Foundation (EFF)
Electronic Warriors Network
Freedom of Information Specialists - FOIA Specialists
HiTecMasterClass (Dutch)
IACR Cryptographers
IACSP: International Association for Counterterrorism and Security Professionals
INFOOPS NLD MoDA (Dutch)
Indian Cyber Warfare
Intelligence & Source Management Professionals
Intelligence 2.0
Iranian Cyber Warfare
Israel Homeland Security and Defense Industry Group
MalwareIntelligence
Military Intelligence Group: China Region
Ministerie van Defensie
NARINT - Natural Resources Intelligence
NIDV (Dutch)
Nationaal Cyber Security Centrum forum (Nederland NCSC)
North Korean Cyber Warfare
OS3 System and Network Engineering
OSINT (Open Source INTelligence)
Open Source Information Security
PRIVATCERT_NL (Dutch)
Privacy & Compliance; Tijdschrift voor de Praktijk
PvIB - Platform voor Informatie Beveiliging (Dutch)
Russian Cybercrime, Hacking and Information Warfare
Samen tegen Cybercrime (Dutch)
Shephard's Electronic Warfare
Stichting Skepsis (Dutch)
The Cyber-Resilient Community Dialogue
Universiteit van Amsterdam (Dutch)

Public and non-public Twitter (last updated: current)

* See https://twitter.com/mrkoot/following 

RSS feeds (last updated: current)

* See https://news.cyberwar.nl/#sources