This directory contains:

et-edit.tgz
E.T. EDITOR (program for modeling three-dimensional structures composed of colored triangles and line segments)
et-travel.tgz
E.T. TRAVELER (program for viewing the scenes designed with E.T. EDITOR as if you are traveling inside the scene)
et-< version>.tgz
both files et-travel.tgz and et-edit.tgz packed together.
et-game.tgz
a game that contains 3D scenes designed with the E.T. EDITOR
snapshot*.png
screen snapshots of the programs
remaining: *.png
renderings of the scenes exported from E.T. EDITOR or E.T. TRAVELER to POVRAY.
subdirectories:
unpacked et-edit.tgz and et-travel.tgz.
et-edit/README.html
Description of the E.T. EDITOR

NOTE:
The programs have been tested on Linux/X11 with NVIDIA GL/GLX libraries.
You can download each *.tgz file, unpack it with the commands:
tar zxvf .tgz
change directory:
cd
read further instructions in the README.html or README file in unpacked directory.