OniGalore:Community portal
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Official sites
Bungie
(developer of original PC and Mac versions)
Oni's mini-site on the site of Bungie (Oni's developers).
Rockstar
(developer of PS2 port)
Oni's mini-site on the site of Rockstar.
Feral
(distributor for Mac)
Take2
(distributor for PC)
Godgames
(publisher)
There used to be an ONI page on Godgames (http://oni.godgames.com/), but the content got deleted at some point.
OmniGroup
(Game port for Mac OSX)
Unofficial sites
Oni Central
The oldest Oni site around. From a few months (years?) before ONI was released to the present day, it has been providing breaking news, miscellaneous information and troubleshooting, as well as a community forum : Oni Central Forum.
Like Oni Central Forum, Oni Central has undergone a few modifications over the course of its history. At the moment, the owner, Harry Al-Shakarchi, is giving the site a complete face lift, and there's not much to see. Use this wiki or the ONI2.NET portal (see below).
OniMia
More or less the Russian counterpart of Oni Central.
Oni Online
A bit outdated, but it has a cool design and a nice walkthrough.
ONI2.NET
An essential part of the Oni community, this is a domain hosted by Alloc, which offers free space for any Oni-related pages/media. This wiki is just one example of the usefulness of this domain.
Hosted on ONI2.NET
Oni Central Forum Map - A map showing the locations of forum members.
edt.oni2.net - An Oni resources site geared towards Mac Users.