glrage | OpenGL wrapper for the ATI 3D C Interface and DirectDraw

For the absolute minimum installation, the original Tomb Raider CD as well as the correct ATI patch besides this wrapper is required:. On default, Tomb Raider is patched for a standalone installation, so you'll need to copy the DATA and FMV folders from the CD to the TR directory. If you want to use the CD instead, you have to set patch_nocd to false in tombati.ini/tombub.ini. To have working music in this mode, you'll need a WinMM wrapper and audio track rips as well. To unlock the full soundtrack, you also need to set patch_soundtrack to true and have all tracks set up in the right order. Here's an overview of all TR1 CD audio tracks, GLRage uses "Raw" if patch_soundtrack is enabled. Also, you'll need to separate folders for TR and TR:UB to avoid clashing files. If you have the GOG.com or Steam release, you'll find the two folders in GAME.GOG/GAME.DAT, which is actually a BIN/CUE image of the Sold-Out Software release of TR. You can temporary rename GAME.DAT to GAME.cue and mount it with WinCDEmu to access the image.
ATI patch for Tomb Raider
ATI patch for Tomb Raider: Unfinished Business (executable only, requires ESCAPE DLLs included in the patch above)
You'll need the 3D Rage Edition of Assault Rigs that was bundled with ATI 3D Xpression cards. Patching the DOS version is not possible, since both game files and CD audio track order are different. Unlike the DOS version, the ATI edition has no CD check, so it'll run without if you don't need the music. For a complete standalone installation with music, you'll need a WinMM wrapper and ripped audio tracks.