rallyup
rallyup is a lightweight Wake-On-LAN (WOL) scheduler
...A typical setup involves configuring most of the infrastructure for WOL but not for Wake-On-Power, and setting rallyup to run on startup on a low-power device like a Raspberry Pi. When you need to bring the entire environment online, simply power on the device running rallyup, and the rest of the infrastructure will automatically follow in the correct order.