SendOut - Affordable email marketing for bloggers and influencers
Really Good Emails - A large collection of good product email design.
Mailblast - Email marketing on a budget using Amazon SES
Email Love - Email design inspiration, templates and discovery
rasa.io - Get more from your email list.
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.