If you are looking for these, Moby Games has a huge collection of them! Looking for larger ones? This site has very large box art (download links on left), but it is in the Czech language.
What
is THAC0? What is AC? How does magic work? Go here, and those questions
and others will be answered. Text file.
Some spells cannot be memorised by Ignus or Dak'kon. This document
also lists the spells available in the game.
Finally, one of the developers posted all this information. Tells
you the special ability and what is does. Go view it!
List of factions, description, whether you can join and how to join
is all stated. Check it out! External Link.
Most players miss the two companions Nordam and Vhailor. This site
tells you how to get those companions, a pic of them (extracted from
core files) and their professions. External Link.
Like the name says, guides you to Hex Editing for Planescape: Torment.
With this knowledge, you can modify your savegames to your heart's
pleasure!
Used in conjunction with the above, you can create spells for mages
and even going to the point of getting mages to cast Priest Spells.
Check it out!
Used in conjunction with the above, you can create items for your
companions.
Extracted from the Planescape: Torment main files, this document contains
the item name and descriptions and what it does. Incomplete.
Extracted from the Planescape: Torment main files, this document contains
the item name and descriptions and what it does. Almost same as above.
The language in the world of Planescape: Torment has different variations
from Earth. A Berk is the same as Jerk. Accustom yourself with this
before paying a visit to that world.
Tells you the hex numbers to some equipment, including a money cheat.
Check it out. MS Word document, so zipped up.
Platter's post in the Interplay Forums about data that was included
in the Torment CDs that were not used in the actual games. Hosted with permission.