ctwm(1x) on Linux
The text 1365168cf40a, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
Claude's Tab Window Manager for the X Window System
Flags it lists
-
-K -
-W -
-cfgchk -
-display -
-f -
-info -
-k -
-n -
-s -
-v -
-version -
-w