Best Referral Programs - A curated directory of startup referral programs
PublicAPIs - Explore the largest API directory in the galaxy
Troopl - Connecting people and companies via the magic of referrals
API List - A collective list of APIs. Build something.
Referral HQ - Get referrals at Google, Facebook, and other top companies!
The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.