LabWakeUp is a project mainly written in C#, it's free.
A little GUI tool to manage your windows boxes waking them up or putting them to sleep
Lab Sleep/Wake up
Just a little program I wrote to manage my windows based lab machines. Put a single server name per line in servers.txt. On startup the program will attempt to find all the MAC addresses and add them to ServerMACs.txt. Now you can choose a server from the drop down and ether shut it down or send it a magic packet to turn it on.
Get latest release in binary form here https://github.com/SQLServerIO/LabWakeUp/blob/master/Release.zip