https://niftools.sourceforge.net/wiki/About_NifTools

Aim and Scope

NifTools is an open source project creating tools—such as an editor, C++ and Python libraries, and import/export plugins for Maya, 3ds Max, and Blender—for files used by the NetImmerse/GameBryo™ game engine. These tools enable users to create and edit 3D models and animations used in several popular PC games.

So far, NifTools has focussed on TES3: Morrowind, Star Trek: Bridge Commander, Freedom Force, Freedom Force vs the 3rd Reich, Dark Age of Camelot, Zoo Tycoon 2, Empire Earth II, Empire Earth III, Civilization IV, Sid Meier's Railroads, TES4: Oblivion, Megami Tensei: Imagine, Pro Cycling Manager, Loki, Prison Tycoon, Wildlife Park 2, Red Ocean, The Guild 2, Axis and Allies, Fallout 3, Fallout New Vegas, Bully SE, and perhaps a few more.

Community

You can visit the NifTools forum for the latest news, to get support, or to discuss game-specific modding techniques.

Development

New faces are always welcome, so if you consider helping NifTools in any way, please read the article on how to contribute. Refer to the list of current developers to see who is working on what.

Documentation

Everyone is encouraged to be bold and contribute to this wiki! If you have no idea how to start out, consult MediaWiki's user's guide for information on using the wiki software. The first thing you probably want to do if you want to start editing, is to sign up.