Clearbit Salesforce Prospector - Quickly build targeted lead lists directly in Salesforce
Really Good Emails - A large collection of good product email design.
TrackingSuite - TrackingSuite is an all in one leadgen, website auditing , seo , crm prospecting tool.
Good Sales Emails - Best sales emails from great companies
UProc for Sheets - Boost your sales, marketing and IT tasks from Google Sheets
Great Email Copy - A dose of emails from around the web.