Outbound Apps by Intercom - Embed apps right inside your messages
Really Good Emails - A large collection of good product email design.
Hotline - In-app chat,real-time engagement & self-service for your app
Good Sales Emails - Best sales emails from great companies
Semrush App Center - Power your marketing by connecting your apps to Semrush data
Great Email Copy - A dose of emails from around the web.