Really Good Emails - A large collection of good product email design.
Cold Email Hacks - Proven cold email templates and tactics for B2B startups
Good Email Copy - Email copy from great companies.
Cold Email Generator - Quickly create a 5-touchpoint email campaign
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
Cold Email Analyzer by Mailshake - Real-time analysis of email subject lines and copy