SEOmator - SEO website analysis & audit tool
Link Research Tools - Recover, Protect, Learn and Grow your SEO with LRT.
SEO Minion - Chrome extension & Firefox add-on to help you with SEO
Ryte - Ryte is a web-based software invented for technical optimization for search engines and improvement of websites.
OnCrawl - OnCrawl is a SEO crawler and log analyzer that helps you improve your SEO performance. Increase traffic, rankings & revenues. Start your 14-day free trial.
Page Optimizer Pro - Page Optimizer Pro is an on-page SEO tool, allows marketers to produce flawlessly optimized pages for Google with ease.