Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.
Startup Stash - A curated directory of 400 resources & tools for startups
Keyword Explorer by Moz - Find the best keywords to improve your website's SEO traffic
The Influencer Marketing Stack - Free resources to launch a killer campaign
Keyword Surfer - Get search volumes & keyword data directly in Google.
Makerbook - A directory of the best free resources for creatives