<spinning the dial, twisting the handle and...>
A lot of that stuff is included in the
Omnibus OTR put together:
What information does this release of the NWN Omnibus contain?
2DA 169 - All 575 .2DA files, current to the 1.69 release
3DS Max Export Scripts - BioWare 3DS Max export scripts documentation, which includes a good deal of information on NWN Custom Content in general. Downloadable separately here
BioWare For Developers - All 22 documents covering NWN file formats (and other things) from this page
BioWare Forums - Offline archives of the following forums from the old BioWare website, each thread in its own .HTML file. The following full forum archives from the old BioWare site are included in this release: NWN Custom Content (ARCHIVE), BioWare News Discussion, Custom Content, For Developers, Scripting, Server Admin & Toolset. Also Stickied threads for every forum were included.
Custom Content Guide 3.0 - The "Bible" of Custom Content. Downloadable separately here.
GMax & Maxscript Help - Help files for GMax (3DS Max 4) and Maxscript, downloadable separately here
Lexicon 169 - The "Bible" of NWScript (and many, many other things as well!), downloadable separately here
Tileset Construction - BioWare's NWN Tileset Construction Tutorial, downloadable separately here. I don't include any of the files, just index the information.
TXI - Every TXI officially released by BioWare as part of their content, segregated by the bif they were found in. Extremely useful for looking up how certain TXI commands were used by BioWare and whether other commands or setting were typically paired with them.
Beyond that, there are the links in my sig and the
wayback machine at archive.org is nothing to be sneezed at.
<...opening the vault>