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.
Peixoto's patch includes a widescreen patch, deinterlaced FMVs, and adds support for XInput controllers among other things
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:
For game mods visit Core Design.