RTUnlocker is a fork of MetroUnlocker that transforms it into a simple .bat file that lets you enable sideloading on Windows RT

Credits to Iemand005 for MetroUnlocker and Snoooopy for mirroring MetroUnlocker.

Get regular MetroUnlocker here:
Mirrored MetroUnlocker repo | Original MetroUnlocker repo

You can find other stuff here, like guides how to install Linux, Tegra Jailbreak USB and much more!: Windows RT Devices Gitbook | Open Surface RT