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Best practices
 Fix broken links
  W3C link checker http://validator.w3.org/checklink

 Spelling and grammar
  Capitalization http://en.wikipedia.org/wiki/Capitalization
  Writing Style http://en.wikipedia.org/wiki/Writing_style
  Word Variations e.g. UK vs US http://en.wikipedia.org/wiki/A...h_English_spelling_differences

 Check website in all browsers
  BrowserShots.org http://browsershots.org/
  Browserling.com https://browserling.com/
  Spoon.net http://spoon.net/browsers

 Decide on www-subdomain
  no-www.org score of 'B' http://no-www.org/
  ...or www.yes-www.org http://www.yes-www.org/
  Handle 'www' in web.config http://madskristensen.net/post...-rewrite-and-the-www-subdomain
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Mobile
 Mobile-Friendly Test
  Mobile Friendly checker https://www.google.com/webmasters/tools/mobile-friendly/
 Use 'viewport' meta-tag
  Don’t Forget the Viewport Meta Tag http://webdesign.tutsplus.com/...-forget-the-viewport-meta-tag/
  Make your website mobile friendly http://www.hanselman.com/blog/...IconsAndAdjustTheViewPort.aspx

 Use correct input types
  Input type: Email, Url, Phone http://html5tutorial.info/html5-contact.php
  Diving in to HTML5 forms http://diveintohtml5.info/forms.html

 Manual check using emulators
  Online media query tester http://screenqueri.es/
  6 free mobile emulators http://www.webdesignerdepot.co...ulators-for-testing-your-site/
  Opera Mobile Emulator http://www.opera.com/developer/tools/mobile/

 Test using real devices
  Use Open Device Labs to test multiple devices http://opendevicelab.com/
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Analytics
 Uptime monitoring
  Uptime robot http://www.uptimerobot.com/
  GotSiteMonitor.com http://www.gotsitemonitor.com/

 Traffic analysis
  Google Analytics http://www.google.com/analytics
  StatCounter http://statcounter.com/
  Clicky http://clicky.com/
  Piwik http://piwik.org/
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Performance
 Google Page Speed score of 90+
  Google Page Speed https://developers.google.com/speed/pagespeed/
 Optimize HTTP headers
  redbot.org http://redbot.org/

 Optimize images
  kraken.io https://kraken.io/
  PunyPNG.com http://punypng.com/
  PNGGauntlet for Windows http://pnggauntlet.com/
  Image Optim for Mac http://imageoptim.com/
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Usability
mod
 HTML5 compatibility check
  Compat Inspector http://ie.microsoft.com/testdrive/HTML5/CompatInspector/
  modern.IE  http://www.modern.ie/report
  Modernizr JS library http://modernizr.com/

 Custom 404 page
   A more useful 404 http://www.alistapart.com/articles/amoreuseful404/

 Favicon
  Real Favicon Generator http://realfavicongenerator.net/
  Favicon Cheat Sheet http://github.com/audreyr/favicon-cheat-sheet

 Use friendly URLs
  11 best practices for URLs http://www.seomoz.org/blog/11-best-practices-for-urls
  URL rewriting in IIS http://www.iis.net/learn/exten...module-configuration-reference
  URL rewrite in Apache http://httpd.apache.org/docs/current/mod/mod_rewrite.html

 Print-friendly CSS
  Set up a print stylesheet http://coding.smashingmagazine...to-set-up-a-print-style-sheet/

 Add search feature
  Google Custom Search http://www.google.com/cse/
  Consider 'Open Search' http://www.opensearch.org/Home

 Environment Integration
  Safari on iOS http://developer.apple.com/lib...onfiguringWebApplications.html
  Internet Explorer on Windows http://msdn.microsoft.com/en-u.../ie/hh781490%28v=vs.85%29.aspx
  Windows 8/10 Tiles http://www.buildmypinnedsite.com/
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Semantics
 Add meaning with structured data
  Schema.org reference http://schema.org/
  Schema-Creator.org http://schema-creator.org/

 Check the semantics
  W3C semantic extractor http://www.w3.org/2003/12/semantic-extractor.html
  Google Structured Data Testing Tool http://www.google.com/webmasters/tools/richsnippets
  Facebook OpenGraph Debugger http://www.google.com/webmasters/tools/richsnippets
  Twitter Card Validator https://dev.twitter.com/docs/cards/validation/validator
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SEO
 SenSEO score of 85+
  SenSEO for Firefox https://addons.mozilla.org/en-US/firefox/addon/senseo/

 Google Rich Snippets
  Online tester http://www.google.com/webmasters/tools/richsnippets
  Getting started http://schema.org/docs/gs.html

 robots.txt
  robots.txt tutorial http://tools.seobook.com/robots-txt/
  Create robots.txt online http://www.robotsgenerator.com/
 XML sitemap
  Create sitemap online http://www.xml-sitemaps.com/
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Code quality
 HTML validation
  W3C HTML validator http://validator.w3.org/
  Dr. Watson http://watson.addy.com/

 CSS validation
  W3C CSS validator http://jigsaw.w3.org/css-validator/

 Run CSS Lint
  Run CSS Lint online http://csslint.net/

 Run JSLint/JSHint
  Run JSLint online http://jslint.org/
  Run JSHint online http://jshint.com/

 World ready
  W3C i18n checker http://validator.w3.org/i18n-checker/

 Automated testing
  Testomato http://www.testomato.com/
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Accessibility
 Accessibility validation
   Common problems and solutions http://accessibility.oit.ncsu.edu/accessibleu/problems.html
   IDI Web Accessibility Checker http://achecker.ca/checker/index.php
   Test using a screen reader http://www.nvda-project.org/

 Color contrast
  Check color contrast online http://www.checkmycolours.com/

 WAI-ARIA Landmarks
  Using WAI-ARIA Landmarks http://accessibility.oit.ncsu....ria-landmarks-a-demonstration/
  Guide to WAI-ARIA http://www.alistapart.com/arti...the-accessibility-of-wai-aria/
  Practical examples http://www.punkchip.com/2010/11/aria-basic-findings/
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Security
 Follow best practices
  ASafaaWeb security analyzer https://asafaweb.com/
  Observatory by Mozilla https://observatory.mozilla.org/

 Cross-site scripting
  XSS cheat sheet https://www.owasp.org/index.ph...ipting)_Prevention_Cheat_Sheet
  DOM based XSS cheat sheet https://www.owasp.org/index.ph...sed_XSS_Prevention_Cheat_Sheet
  Free XSS scanner http://www.acunetix.com/cross-site-scripting/scanner/

 Cross-site request forgery
  Explanation and walkthrough http://www.codinghorror.com/bl...request-forgeries-and-you.html
  CSRF cheat sheet  https://www.owasp.org/index.ph..._(CSRF)_Prevention_Cheat_Sheet

 Secure connection (SSL)
  Setup SSL on IIS 7 http://support.microsoft.com/kb/299875
  Setup SSL on Apache http://www.digicert.com/ssl-ce...ficate-installation-apache.htm
  SSL Server Test https://www.ssllabs.com/ssltest/

 HTTP Strict Transport Security
  MDN Overview https://developer.mozilla.org/...HTTP_Strict_Transport_Security
  OWASP Overview https://www.owasp.org/index.ph...HTTP_Strict_Transport_Security

 Enable Content Security Policy
  Content Security Policy http://www.html5rocks.com/en/t...urity/content-security-policy/
  MDN Guide https://developer.mozilla.org/.../Using_Content_Security_Policy
  OWASP Overview https://www.owasp.org/index.php/Content_Security_Policy
  CSP Tester https://github.com/oxdef/csp-tester
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Social Media
 Open Graph protocol
  Open Graph protocol reference http://ogp.me/

 Twitter Cards
  Documentation https://dev.twitter.com/docs/cards

 Facebook Insights
  Facebook Insights https://developers.facebook.com/docs/insights/

 Google+
  Google+ Publisher https://support.google.com/webmasters/answer/1708844?hl=en
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...and finally
 Add humans.txt
  We are humans, not machines! http://humanstxt.org/
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