SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Really Good Emails - A large collection of good product email design.
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
Good Email Copy - Email copy from great companies.