The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.
The Content Odyssey Newsletter - Every other week I discuss one B2B content experiment
PublicAPIs - Explore the largest API directory in the galaxy
ShareIt by SocialPilot - Free Content Curation and Influencer Discovery Tool
API List - A collective list of APIs. Build something.
Digital Library - Organize your books, track your reading and write reviews