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Umbrel - Run your personal server on a Raspberry Pi or Ubuntu/Debian, self-host open source apps like Nextcloud, Matrix, and Bitcoin node, and take full control of your data. For free.
Coinbase - Bitcoin, safe and easy.
websocketd - Turn any program that uses STDIN/STDOUT into a WebSocket server. Like inetd, but for WebSockets.
Binance - Cryptocurrencies exchange platform
Bitcoin Core - Bitcoin
Poloniex - US-based cryptocurrency exchange with maximum security