3rd party stuff for Oni just got a bit more distant. Matt (of Bungie) has commented in the Oni Central forum about the possibility of the Oni tools being released to the public:

I don't think any of the Oni tools will see a public release, mainly because we don't own Oni anymore, but then I didn't expect us to ever release the Marathon source. Stranger things have happened.

Erm... not good. It didn't seem like Bungie was going release any editors, but the little hope that we had is now gone. Thanks, Rolf.

Addendum: I hadn't noticed this at the time, but it's important to note that the date on the post is 10/5/00. While it's not new information, it currently stands anyway. Thanks, Modem.