Seo Tools (seo araçları) Siteleri (yabancı seo kaynakları)

https://moz.com/researchtools/ose
http://www.semrush.com
http://www.semrush.com/features/keyword-research/?gclid=CjwKEAiAx4anBRDz6JLYjMDxoQYSJAA4loRm0f8_0yqzHSgOY48isD31Y4he6OfDclb08lDP8bsQLBoCzmjw_wcB
http://www.wordstream.com/keyword-niche-finder
http://www.canirank.com/#keywords