Hecto - A platform to buy, sell and manage newsletter advertisements
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!
SponsorGap - Finding the right sponsor just got easier
PEAR - Connecting newsletters and advertisers 🍐
LetterWell - Buy and sell ad space in email newsletters
Letterfuel - Grow your audience with a curated newsletter