1. Surfer SEO: https://surferseo.com/
2. Hemingwayapp: https://hemingwayapp.com/
3. Frase: https://www.frase.io/
4. Smartly: https://www.smartly.io/
5. Seventh Sense: https://www.theseventhsense.com/
6. Phrasee: https://phrasee.co/
7. MarketMuse: https://www.marketmuse.com/
8. Scalenut: https://www.scalenut.com/
9. ContentEdge: https://www.contentedge.com/