Weferral - Open source referral & affiliate management software

Swapstack - Swapstack, now acquired by beehiiv! Check out what we're doing over at beehiiv's incredible ad network: https://www.beehiiv.com/features/ad-network/brands and come thrive with the hiiv!

Viral Loops - Viral Loops is a viral and referral marketing platform to launch ranking competitions, sweepstakes, pre-launch and referral programs.

PEAR - Connecting newsletters and advertisers 🍐

Waitlist API - Quick and easy waitlist with built in referral.

LetterWell - Buy and sell ad space in email newsletters