Best Referral Programs - A curated directory of startup referral programs
CryptoKitties - Breed and collect adorable creatures using Ethereum
Viral Loops - Viral Loops is a viral and referral marketing platform to launch ranking competitions, sweepstakes, pre-launch and referral programs.
Mars Genesis - 10,000 unique parcels of Mars stored on the blockchain
GrowSurf - Referral software for B2C, FinTech, and SaaS companies.
Cryptocats - Cute little 8-bit cats on the Ethereum Blockchain