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.
The Eye - The Eye is a non-profit website dedicated towards content archival and long-term preservation.
PST.NET - Virtual payment cards for online shopping and advertising
AudioFreebies.com - Free audiobook codes - Audible promo codes - audiobook marketing- audio book free - author giveaways - free books - book competition - narrators - authors
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
LibriVox - free public domain audiobooks