The Garden of Eden Creation Kit, other wise known as G.E.C.K. is a device designed by Vault-Tec to be able to bring life back to the waste land once people left the Vaults.
Where Found Edit
One can be found at Vault 87 where the Super Mutants mainly reside (if you know the number, please put it in), and Fawkes can retrieve it for you.
See Also Edit