Really Good Emails - A large collection of good product email design.
Lite Pae - A fully native Salesforce app to capture payment using Stripe
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
Email Studio for Gmail - Send personalized emails, schedule emails directly in Gmail
Good Email Copy - Email copy from great companies.
LeaseLock - Insurance for rent payments (apartment cosigner alternative)