Podopi - Get more value out of your blog by automatically creating a podcast, YouTube videos, and audio to embed on your site.
Content Idea Generator - Free tool creates ideas for your content marketing strategy
TheSeoLabs - Find news guest post opportunities with more than 15 000 Blogs that accept guest post, with contact information and SEO metrics.
Content Marketing Stack - A curated directory of content marketing resources
Sponsr.Us - Social fundraising for student projects
Zestack - Stackoverflow for marketing & growth