MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.
WhoSentWhat - We bring email newsletters from inbox to web
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Really Good Emails - A large collection of good product email design.