The Oni Save Game Editor has been updated to version 1.3 for both Macs and PCs. The latest update is compatable with the full version of Oni including the different language versions. Other options (not listed here because they are potential spoilers) are now available, too.

OSGE is an editor that will let you modify all of your save points in Oni. You can give yourself more ammo, different weapons, additional hypos, and even make yourself invisible. Check out the OSGE page to download.