Here is a mini PC originally I bought to build my TOFFEE Wan Optimization hardware device with Intel Celeron C1037U fanless hardware. Later I tested and played around with OpenWRT. Alternatively you can also use this hardware to build a mini NAS Server (with Ubuntu Server, Openmediavault, Network Firewall with pfSense, OPNsense and so on.
Refer:
OpenWRT ↗
pfSense ↗
OPNsense ↗
openmediavault ↗
A sample low-performance TOFFEE Hardware which I built: