The latest official patch 2 is available at www.tombraiderchronicles.com and at soggi.org.
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:
Peixoto's patch includes a widescreen patch, deinterlaced FMVs, fixes the window border on windows 10 and allows you to use the iOS textures pack and remastered FMVs among other things
The Multipatcher doesn't include any fixes for Gold, unfortunately.
HKEY_CURRENT_USER\Software\Core Design\Tomb Raider II\System
Download and install the Tomb Raider series fullscreen border fix.
Tomb Raider Update Files\TR2
For game mods visit Core Design.