ctsimtext(1) on Linux
The text de2afa43066c, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 6.0 (Squeeze) shipped it. The page shows this text now.
A Text-Based Computed Tomography Simulator