Also, long ago there was Prothon, which wasn't exacyly python but was very close, and didn't have a GIL. Unfortunately, it seems all source code drops of this disappeared from the earth, though you can still find some mentions e.g. http://blog.ianbicking.org/initial-thoughts-on-prothon.html

I don't remember how Vyper worked, but it might have abolished the GIL too: http://got.net/~landauer/sw/vyper_readme.html