Taco Digest - Customizable personal email newsletter created from your favorite sources.
Interactive NPS Calculator (by Delighted) - Calculate your NPS easily with this interactive free tool.
Sponsor This Newsletter - 100+ newsletters ready to promote your product
TinyNPS - Simple NPS feedback
Newsletter Operating System - All-in-one dashboard to launch & grow your newsletter
Delighted + NomNom Integration - Turn your NPS responses into product insights