Topvisor - All in one SEO and PPC tools for better marketing.
Software Product Management Stack - Resources & tools to help you manage your software product
Nibbler - Free tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.
The Product Management guide - A book on how to create and ship products that people love
Keyword Explorer by Moz - Find the best keywords to improve your website's SEO traffic
Product Management Exercises - A repository of product manager job interview exercises