If you want to spy on your competitor's keywords, several free SEO tools can help. Ubersuggest is a great option. It provides keyword data and shows what your competitors are ranking for. Google Search Console is also useful for identifying keywords that drive traffic to competitor websites. Another tool is Moz's Keyword Explorer. It allows you to research keywords and analyze competitor performance. You can also use Answer the Public to find the most common questions and topics people search for in your niche. These free tools give you valuable insights into your competitors' keyword strategies.