Really Good Emails - A large collection of good product email design.
Digimmerce.com - Easiest Way to Set Up an Online Store
Email Kick - Email designer and analytics for your transactional emails.
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.
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.
INKBRUSH - Inkbrush is a web based email design and coding tool.