MailChimp Snap - Send simple, photo-based email campaigns from your phone.
Mail Designer 365 - Discover Mail Designer 365, the easiest way to design mobile-optimized HTML emails, templates and newsletter designs. Your HTML email designer for Mac.
Polymail Sequences - Simple, powerful multi-stage email campaigns
Really Good Emails - A large collection of good product email design.
Pico - A stupidly simple and blazing fast, flat file CMS
Campaign Genius - Send dynamic email content through any platform, instantly.