Miniature Mail - Little letters printed on demand and sent in tiny envelopes.
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.
MailThis - Send mail from your computer
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
Pakible - Custom packaging, made simple. 10 boxes for $10
PST.NET - Virtual payment cards for online shopping and advertising