Really Good Emails - A large collection of good product email design.
Social Champ - Social Champ - The Efficient Social Media Management Tool and Scheduler
Good Sales Emails - Best sales emails from great companies
Social Aider - Social Aider is an affordable, user-friendly social media management tool that helps businesses to enhance their marketing campaigns.
Great Email Copy - A dose of emails from around the web.
AWARIO - Track brand mentions & competitors across the web