Really Good Emails - A large collection of good product email design.
SendX.io - SendX (https://sendx.io) provides remarketing and retargeting tools for web businesses. You can use popups, landing pages, email, web push notification, automation workflows and FB / Google retargeting to drive more revenue.
Good Sales Emails - Best sales emails from great companies
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Great Email Copy - A dose of emails from around the web.
ConvertKit - Email marketing software for online creators. We help you earn a living online through an intuitive email marketing automation tool.