Content Idea Generator - Free tool creates ideas for your content marketing strategy
Serpstat - Search analytics, Rank tracking, Backlink analysis and Site Audit tool.
Content Marketing Stack - A curated directory of content marketing resources
Answer Socrates - Discover content ideas using real Google data
Keyword Tool & Content Assistant - Content optimization tool to boost your rankings
Pasteline - Pasteline is an app for quickly saving notes, quotes, and links.