Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.

Delighted - The fastest and easiest way to gather actionable feedback from your customers

MJML - The open source framework for responsive emails

UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!

Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.

Wootric - Wootric is software that allows apps and websites to take customer satisfaction surveys so that you can properly gauge the popularity and success of your app through the eyes of the people using it. Read more about Wootric.