The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.
Actually Read It Later - Save articles for reading later
PublicAPIs - Explore the largest API directory in the galaxy
Firefox Advance - Experimental recommendation engine built into Firefox
API List - A collective list of APIs. Build something.
ShareIt by SocialPilot - Free Content Curation and Influencer Discovery Tool