AirPay - Integrate all payment channels via one single API
Really Good Emails - A large collection of good product email design.
LeaseLock - Insurance for rent payments (apartment cosigner alternative)
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
Lydia - Lydia lets you use your card whatever you need to pay, even a friend.
Good Email Copy - Email copy from great companies.