LetterHunt - LetterHunt connects you to 10,000+ niche, active newsletter writers to promote your product.
Taco Digest - Customizable personal email newsletter created from your favorite sources.
Newsletter Operating System - All-in-one dashboard to launch & grow your newsletter
Unzip.dev - Discover the latest developer trends
Bytesized - Weekly newsletter covering important ideas for developers 💌
Kickstart Side Hustle Newsletter - Dwarf-size newsletter with viral marketing case studies