After the first time launching the game, the launcher won't show up again and you will be unable to configure the settings.
To make the launcher open again, use -setup as an argument.
TRNG is a fan made update to the game's included level editor with a lot more features than the original one.
Tomb Raider Mouse Helper is a utility which allows controlling Lara with the mouse. It also maps the WASD keys to enable a more modern, keyboard+mouse control scheme.
OpenTomb is an open source remake of the Tomb Raider engine. It overhauls almost all aspects of the game engine, along with adding cross-platform support for modern operating systems and Lua scripting support.
Important links regarding the project:
Download and install the Tomb Raider series fullscreen border fix.
For game mods visit Core Design.