PandaDoc for Developers - PandaDoc for Developers — easy and scalable all-in-one API solution for generating documents and capturing eSignatures by embedding them into your app, website, or using the backend API.
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
Presentation templates by Pitch - Designed for big ideas and customizable for any story
Really Good Emails - A large collection of good product email design.
Good Email Copy - Email copy from great companies.
Paperplane - High quality HTML to PDF conversion API for developers.