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Google AdWords Keyword Planner (Requires a free AdWords account)
Google Webmaster Tools - The most accurate tool for website owners to identify keywords driving visitors.★★★★
TagCrowd - Use this free keyword tag cloud tool on a page of content to see the prominent keywords.★★★★
Synonym Finder - Find related phrases for keyword research.
Google Trends: Identify related phrases and their search volume.
Merge Words: Great for creating lists of long-tail keywords.
Google Optimize: Optimize is free and integrates with Google Analytics.
Robots.txt Checker: This robots.txt checker is a "validator" that analyzes the syntax of a robots.txt file to see if its format is valid as established by Robot Exclusion Standard or if it contains errors.
Wayback Machine: Historical view of web pages
HTML Validation validator.w3.org
LikeAlyzer: Analyze and monitor your Facebook page.
SteadyDemand – Google+ Page Audit Tool
copyscape.com - finds web pages containing your content.
SEMRush – A competitor research tool for keywords and rankings.
Keyword Tool: Locate long tail keywords in an easy to manage format. Less robust version available for free
Wordtracker’s database of 3.5 billion searches per month, is completely independent of Google’s data.
MOZ Keyword Difficulty Tool is part of an excellent Pro tool suite.
Raven Tools - Keyword data plus a full suite of tools.
KeywordSpy – Great for discovering competitive keyword analysis.
CrazyEgg: great for helping clients visualize user engagement.★★★★
Optimizely: A/B testing and Conversion Rate Optimization
Visual Website Optimizer allows you to run A/B tests with a simple online editor that lets you test content without knowing code.
SEO Browser – quick glance at a web page’s important SEO structure.
Screaming Frog SEO Spider: A tool we use all the time to review data search crawlers see on a website.
SocialBro: Provides Twitter data