GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Really Good Emails - A large collection of good product email design.
Master of Letters Podcast - Learn what others are doing to drive traffic to their site
Good Email Copy - Email copy from great companies.
KeywordTool.io - KeywordTool.io is the best FREE alternative to Google Keyword Planner and Ubersuggest. It uses Google's autocomplete feature to get over 750+ long-tail keywords for any given query.
Good Sales Emails - Best sales emails from great companies