OniTools

Not to be confused with the OniTools add-on for Mod Tool.

Ian Patterson began developing OniTools in 2000 based on his reverse-engineering of Oni's demo, making it the first modding tool for Oni. Although OniTools was a crucial part of the early history of Oni modding, it is now superseded by OniSplit and accompanying GUIs such as Vago.

Info and download: http://oni.moltenstudios.com/downloads/ianpatt.php (use link at bottom of page). (Warning: This is a Classic app, so it will not run on modern Macs.)

OniTools was ported to Windows as WinOni: http://oni.bungie.org/res/utilities.html#winoni

An alternative program in Windows, apparently not based on the same code, was OniTools.NET: http://ssg.oni2.net/subfold/download/OniTools_NET.zip (requires .NET 2.0)