Another way you can try Julia online at the moment is William Stein's cloud.sagemath.com If you really want to try juliabox.org you can look at the other post

Another way you can try Julia online at the moment is William Stein's cloud.sagemath.com If you really want to try juliabox.org you can look at the other post about Julia on the HN page. Near the bottom of the HN comments are some details that may or may not be useful with regard to getting an invite code.