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.
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
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
Early Stage Founders Playbook - Rated 5 out of 5 by indie-hackers and techie founders who love building features and feel hesitant about marketing.
PST.NET - Virtual payment cards for online shopping and advertising
IndieEarnr - 580+ Affiliate Programs for Indie Hackers & Creators