Legacy Doom is DooM port. Some of supported features:
    *  VIDEO OPTIONS MENU
    *  TRANSLUCENCY ON SPRITES AND WALLS
    *  SETUP CONTROLS MENU
    *  LOOK UP AND DOWN (FREELOOK)
    *  CHASE-CAM : also called a 'third-person' view, or 'Tomb Raider' view.
    *  CONSOLE
    *  STATUS BAR OVERLAY
    *  SKINS

WWW: http://legacy.newdoom.com/
WWW: http://sourceforge.net/projects/doomlegacy