SEO关键词研究工具（付费免费都有）
- marketsamurai – 付费
- semrush.com – 付费
- spyfu.com – 付费
- wordtracker.com – 付费
- 7search.com – 免费
- tejji.com – 免费
- keywordeye.com – 免/付费
- longtailpro.com – 付费
- seochat.com – 免费
- GKP – 免费
- metaglossary – 免费
- soovle.com – 免费
- keywordspy – 付费
- serps – 免费
- secockpit – 付费
- serpstat – 付费
- ahrefs – 付费
- kwfinder – 付费
- hittail – 付费
- freshkey – 付费
- k-meta – 付费
- rankbrain – 付费
- jaaxy – 付费
- seorch – 免费
- seedkeywords – 免费
- keywordrevealer – 付费
- keywordtool – 免费
- ubersuggest – 免费
- keywordtooldominator – 付费
- keywordsnatcher – 付费
- termexplorer – 付费