Some free SEO tools, you may need

Some free SEO tools, you may need

Keyword Research
1. Google AdWords Keyword Tool: www.adwords.google.com/KeywordPlanner
2. Wordtracker: https:wordtracker.com
3. Ubersuggest: www.ubersuggest.io
4. Latent Dirichlet Allocation Content Optimizer: www.ntopic.org/writer.php

Backlink Investigation
1. Open Site Explorer: https://moz.com/researchtools/ose
2. Majestic SEO Site Explorer: https://majestic.com
3. Link Diagnosis: www.linkdiagnosis.com

Content & Markup Analysis
1. Copyscape: www.copyscape.com
2. W3C Markup Validation Service: http://validator.w3.org

Server Investigation
1. BuiltWith: www.builtwith.com
2. Pingdom Full Page Test: https://tools.pingdom.com
3. Google PageSpeed: https://developers.google.com/speed/pagespeed/insights
4. URI Valet: https://urivalet.com
5. Spy On Web: http://spyonweb.com