Google PageSpeed
https://developers.google.com/speed/pagespeed/insights/
https://chrome.google.com/webstore/detail/google-pagespeed-insights/hfebkooaidmeboeblkkejdoepilnnjhn
http://webdevchecklist.com/
https://testmysite.thinkwithgoogle.com/
Google Analytics
https://analytics.google.com/Google Webmaster Tools
https://www.google.com/webmasters/tools/home?hl=en&pli=1
Tag Manager
https://tagmanager.google.com/
Google Trends
http://www.google.com/trends/
Structured Data Test
https://search.google.com/structured-data/testing-tool?hl=en-GB#
