Binance Academy - Free learning resource for blockchain and crypto

Solo - Personal kanban boards hosted on your own server

CryptoHack - A fun platform for learning cryptography

Cash App - The easy way to send, spend, bank, and invest.

Coin Demo - Visual demonstration of how bitcoin transactions work

Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.