Content Strategy Tools - 7 steps and tools to create a content marketing strategy
Open Strategy - The best tools to help you build your startup
SaaSHub - Find and promote software that will help you grow your business or to be more productive.
Startup Stash - A curated directory of 400 resources & tools for startups
Content Marketing Stack - A curated directory of content marketing resources
Freebie.Supply - Awesome free things for entrepreneurs & startups