This is some of the Jedi Knight related material that I have found.
Jedi Knight Cheat Codes
Mysteries of the Sith Cheat Codes
I have three different kinds of screenshots from Jedi Knight. Single-Player, Multi-Player and Mysteries of the Sith.
Single-Player Screenshots
Multi-Player Screenshots
Mysteries of the Sith Screenshots
Game images ©1997 Lucasfilm Ltd. Star Wars, Dark Forces and the LucasArts logo are registered trademarks, and Jedi Knight is a trademark of Lucasfilm Ltd.