SERPStream is a 100% free SEO tool. Members can keep track of their site's Search Engine Results Page position with updates as frequent as a dozen times a day. SERPStream have a great newsletter, sends email alerts, and have a state of the art keyword rank tracking dashboard.
Siteimprove - Consider the Siteimprove Intelligence Platform the newest member of your team.
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
Sitebeam - Spelling mistakes, SEO, load speed, social media, code, W3C, accessibility & more in one tool.
SEO PowerSuite - Get all SEO tools in one pack - download free edition of SEO PowerSuite and get top 10 rankings for your site on Google and other search engines!
Ryte - Ryte is a web-based software invented for technical optimization for search engines and improvement of websites.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.