Security related sites, and tools.

Check for vulnerabilities 
https://www.browserleaks.com 
https://browsercheck.qualys.com
http://www.haveibeenpwned.com
http://www.java.com/en/download/uninstallapplet.jsp
http://secunia.com/community/advisories/search/
http://secunia.com/vulnerability_scanning/personal/
http://www.whynopadlock.com
http://www.sslshopper.com/ssl-checker.html
https://www.ssllabs.com/ssltest/

Security for communications
https://proxpn.com/freemium.php
https://airvpn.org
http://www.gnupg.org
http://www.gpg4win.org
https://www.startssl.com/?app=1
https://www.comodo.com/home/email-security/free-email-certificate.php
https://calomel.org/ssl_certs.html (Guide to Webserver SSL Certificates)
https://letsencrypt.org
https://www.sslshopper.com/article-free-ssl-certificates-from-a-free-certificate-authority.html
https://konklone.com/post/switch-to-https-now-for-free

DNSSEC – Secure DNS Lookups
https://wikipedia.org/wiki/Domain_Name_System_Security_Extensions
https://www.grc.com/dns/benchmark.htm
https://www.f-secure.com/en/web/labs_global/dns-check
http://www.howtogeek.com/161808/htg-explains-what-is-dns-cache-poisoning/ 
http://www.opennicproject.org/configure-your-dns/ 

156.154.70.22   UltraDNS
156.154.71.22   UltraDNS

8.8.8.8       Google
8.8.4.4       Google

193.67.79.39    UUNET
193.78.240.12  UUNET
194.98.65.65    UUNET
195.129.12.83  UUNET
158.43.128.72  UUNET
158.43.240.4    UUNET

195.99.66.220  BT

Browser plugins
https://www.eff.org/https-everywhere
https://github.com/kbitdk/kbsslenforcer
https://calomel.org/firefox_ssl_validation.html
http://perspectives-project.org
http://addons.opera.com/extensions/details/swiss-knife/
http://addons.opera.com/extensions/details/redirect-to-https/
http://addons.opera.com/extensions/details/lastpass/
https://browsec.com

http://addons.opera.com/extensions/details/port-scanner/
http://addons.opera.com/extensions/details/privly-2/
http://addons.opera.com/extensions/details/duckduckgo-for-opera-2/
http://addons.opera.com/extensions/details/duckduckgo-settings-autoloader/

http://addons.opera.com/extensions/details/redirect-bypasser/
http://far.whochan.com/wlog.cgi/LinkRedirector

http://addons.opera.com/addons/extensions/details/stay-secure-sd
http://addons.opera.com/extensions/details/geodata-for-ip/
http://addons.opera.com/extensions/details/nettools/

http://addons.opera.com/extensions/details/guidesyoosecurity/

BLOCKING
http://addons.opera.com/extensions/details/opera-adblock/
http://addons.opera.com/extensions/details/block-linkbucks-opera-edition/
http://winhelp2002.mvps.org
https://www.grc.com/Shieldsup!
http://bit.ly/checkcookie

http://www.fbpurity.com
http://socialfixer.com
http://addons.opera.com/extensions/details/extendtube/

https://vivaldi.net/forum/private-browsing/412-browser-plugins 

Security Now! podcast http://leoville.tv/podcasts/sn.xml
Security Now (Video-LO) http://feeds.twit.tv/sn_video_small

https://vivaldi.net/blogs/entry/online-anti-malware
https://vivaldi.net/blogs/entry/security-p2p

EFF RSS Newsfeed https://www.eff.org/rss/updates.xml
https://www.eff.org/observatory

Report Phishing
http://www.phishtank.com  (verify  phish)
http://www.antiphishing.org/report-phishing/ 
http://toolbar.netcraft.com/report_url

Unsubscription and Opt-out info
http://www.networkadvertising.org/choices/ 
http://www.youronlinechoices.com/uk/your-ad-choices (choose your country)
http://justdelete.me
http://www.godelete.com