Content Marketing Stack - A curated directory of content marketing resources
SEO Analyzer By Neil Patel - A free SEO analyzer for your site
The Influencer Marketing Stack - Free resources to launch a killer campaign
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
Serpstat Website SEO Checker - Check your website's SEO, analyze competitors and keywords