EngageCamp - Free marketing content hub
Quuu - Quuu is a curated content suggestion platform that connects to your Buffer queue, allowing you to grow a relevant social media following across your entire social landscape.
Topic Research by SEMrush - Content ideas that resonate with your audience
Content Marketing Stack - A curated directory of content marketing resources
Content Idea Generator - Free tool creates ideas for your content marketing strategy
Embedly - Embedly helps publishers and consumers manage embed codes from websites and APIs.