Some options for machines that can be used to self-host a Nostr app:

Raspberry Pi

- Low-cost, small single board computers

- Models like Raspberry Pi 4 have enough CPU and RAM to run Nostr clients

- Easy to set up, portable, low energy usage

Linux VPS

- Virtual private servers running Linux

- Providers like DigitalOcean, Linode, Vultr allow deploying custom Linux VMs

- More flexibility and options for computing power and resources

Linux on a home media server

- Old desktop or laptop hardware can be repurposed

- Lightweight Linux distro like Ubuntu Server or Docker

- Always-on convenience for self-hosting

Linux development board (SBC)

- Single board computers like Asus Tinker Board, ODROID, Rock64

- Power efficient with GPIO, networking and USB capabilities

- Reasonable compute power for self-hosting

On a NAS (Network Attached Storage)

- Many DIY and consumer NAS devices run Linux

- Can install Linux applications alongside storage functions

- Built-in availability as network attached appliance

The common requirements are ability to run a Linux or Unix environment and

connectivity to the internet. More powerful hardware allows supporting increased

users and workloads.