The Simple Postcard - Text a photo to mail it as a postcard
MyBrocard - Brocard allows you to create an unlimited number of virtual cards for paying for advertising and other online payments, manage a team of buyers, choose from 20+ bins for various tasks, and enjoy convenient API for integrations.
Felt for iPhone - Handwritten cards for the modern world
Coinramp - The Coinramp Card lets you spend over 10+ cryptocurrencies like cash, online, in-stores and ATM withdrawals. Available in 100+ countries, no ID needed. Anonymous Crypto Cards
Send Mail Get Mail - A postcard-sending website.
PST.NET - Virtual payment cards for online shopping and advertising