OniLib is a visual editor that works on Oni's .dat files, reading the resources inside them and offering a customized interface for editing the individual types. It currently edits:
ABNA
AGQC
SNDD
IGST
as well as allowing one to edit Oni's saved game file, persist.dat (Intel format only). It runs on Intel and PPC Macs.

OniLib uses Sparkle to automatically check for and apply updates when they are released.

A little Trainer for ONI.
Now including the sources.
Written by: Alloc

An application with the purpose of facilitate the process of change the game keys. Fully supports Anniversary Edition, and runs in Windows, Mac and Linux.

more info:
http://oni.bungie.org/community/forum/viewtopic.php?id=1546

It's a bot editor. It can simplify the editing of BINACJBOCharacter.oni/.xml
I simple looking almost-user-friendly GUI.

Discuss - Here

Provides an easy and fast method to install scripts in oni. (AE supported)

This package also include the installer.osi generator and an example script.

More information here:
http://oni.bungie.org/community/forum/viewtopic.php?id=1411

OniSplit GUI 0.9.1

- Added Media Tab. Listen to SNDDs and watch TXMPs. All credits to EdT. It's his idea.
- Fixed a bug when you try to convert an *.obj to M3GM and GUI doesn't show you any *.objs when you click browse.
- Launch OniSplit with my GUI once and then press Ctrl+E. GUI will paste last param line to Manual Command Input field so you can use some functions of OniSplit I haven't implemented yet.

Since Gumby himself doesn't know what is making AEI dislike some bsl-only mods I didn't touch AEPackage Creating Tab too much.

AETools version 3 is a multi-purpose tool.

Features

* Extract and Convert a number of binary data types such as ONCC, ONWC, M3GM, TXMP, TRAM and many more.
* Create a package for the Anniversary Edition.
* Utilities and tools for the advanced users.

To install, simply place the enclosed application and the AETools_Data folder inside your Oni/Edition folder.

A GUI-based tool for viewing and replacing Oni resources. See http://wiki.oni2.net/OniUnPacker for more info.

A tool that edits persist.dat (your saved game) to allow you to change the health/weapons/ammo/etc. that you have at a certain savepoint. Also can unlock all the savepoints that you haven't gotten to yet. Also can change the "killed_griffen" variable.

Run this program as administrator if necessary.

A script editor made to assist in the writing of BSL, with inline documentation.