Free SEO Tools is free SEO Tools to help developers and SEO marketers with one of the best Search Engine Optimization apps available today. This app is completely free to use. Most Popular tools included are: Bonus! Website SEO Analyzer. 1. Alexa Rank. 2. MozRank. 3. Page Authority. 4. Google SERP Keyword Position. 5. PageRank Check. Seo research tools.