The 1.0.3 version of WakeOnCommand for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X was originally developed by Doug Brown. We recommend checking the downloaded files with any free antivirus.
From the developer:
WakeOnCommand is a simple utility that can send “magic packets” to wake up sleeping computers supporting Wake-on-LAN (also called Wake for network access in macOS). All you need to do is enter the IP address and MAC address of a computer, and then click the Wake button. WakeOnCommand will remember the computers you enter for future use.