There are a lot of free SEO tools out there, but they don't have as many helpful features as paid alternatives. However, if you want to monitor your SEO and do keyword research for free, you can try one of these tools: 1. Google Keyword Planner. 2. Moz Link Explorer. 3. Google Trends. 4. Google Analytics. 5. Google Search Console. 6. Keyword Hero. 7. Screaming Frog.