Free SEO Tools You Should Know About

If you like SEO tools and you’re a fan of free stuff, you’re going to like this list of free SEO tools.

Backlink Investigation
1. Open Site Explorer:
2. Majestic SEO Site Explorer:
3. Ahrefs Site Explorer:
4. Link Diagnosis: iAcquire presents Link Diagnosis - examine your link competition

Server Investigation
1. BuiltWith: BuiltWith Technology Lookup
2. Pingdom Full Page Test:
3. Google PageSpeed:
4. URI Valet:
5. SpyOnWeb: Research Tool - Internet Competitive Intelligence

Website Crawling & Link Checking
1. Screaming Frog SEO Spider Tool:
2. Xenu’s Link Sleuth: Find broken links on your site with Xenu's Link Sleuth (TM)
3. W3C Link Checker: W3C Link Checker

Content & Markup Analysis
1. SEO Browser: Free SEO Software Tool & Text Browser, Search Engine Optimization Tools - SEO Browser
2. Copyscape: Copyscape Plagiarism Checker - Duplicate Content Detection Software
3. W3C Markup Validation Service: The W3C Markup Validation Service

Keyword Research
1. Google AdWords Keyword Tool:
2. Wordtracker:
3. Ubersuggest:
4. Latent Dirichlet Allocation Content Optimizer: nTopic Relevant Content Writer and Scorer Tool to Improve Topical Relevancy

Competitive Keyword Analysis
1. SpyFu: SpyFu Keyword Research Tools | Discover The Most Profitable Keywords For PPC & SEO
2. SEMRush:

Social Discovery
1. Shared Count:
2. SocialMention: Real Time Search - Social Mention
3. Follower Wonk:

PR & Outreach
1. HARO – Help a Reporter Out:
2. Blogger LinkUp: Blogger Link Up
3. MyBlogGuest: Guest blogging: Looking for guest bloggers or guest post? Join MyBlogGuest!
4. DoubleClick Ad Planner:

1. Google Analytics: Google Analytics - Mobile, Premium and Free Website Analytics ? Google
2. Open Web Analytics: Open Web Analytics
3. Piwik:

Search Engine Guidance
1. Google Webmaster Tools:
2. Bing Webmaster Tools: Bing - Webmaster Tools

SEO Analysis
1. WooRank:
2. Lipperhey:
3. Pearanalytics: Digital Marketing Agency - Pear Analytics

Good luck to you,