Blogs
Google Webmaster Central Blog http://googlewebmastercentral.blogspot.com

Information Gathering
Copyscape http://copyscape.com
Google Alerts https://www.google.com/alerts
Google Mobile Friendly Test https://www.google.com/webmasters/tools/mobile-friendly
Google Trends http://www.google.com/trends
IntoDNS DNS Check http://www.intodns.com
MOZ Open Site Explorer https://moz.com/researchtools/ose
MX Toolbox http://mxtoolbox.com
Pingdom Website Speed Test http://tools.pingdom.com/fpt

SSL
RapidSSL Intermediate CAs https://knowledge.rapidssl.com/support/ssl-certificate-support/index?page=content&id=AR1549
SSL Server Test https://www.ssllabs.com/ssltest
SSL Certificate Check https://cryptoreport.geotrust.com/checker
SSL Certificate and Key Check https://www.sslshopper.com/certificate-key-matcher.html

Website Tools
Google Analytics https://www.google.com/analytics
Google Webmaster Tools https://www.google.com/webmasters/tools
Wordpress Database Updater http://nerret.com/wordpress-tools/Search-Replace-DB-master

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