Trying to uninstall gives me:
npm uninstall alloy -g
npm ERR! Error: EACCES, unlink '/usr/local/share/npm/lib/node_modules/alloy/.npmignore'
I install all nodejs, npm and brew stuff in my name. So I think it's Titanium Studio that has install alloy and titanium with "nobody" as user.
We need someone else to confirm but if it's TiStudio then... well it's annoying.