Solo - Personal kanban boards hosted on your own server

Bitcoin Flip - Trading Simulator for all the popular crypto currencies.

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

Coinzy - Top need-to-know crypto news in less than 8 minutes a day

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.

CryptoHack - A fun platform for learning cryptography