goop(6x) on Linux
The text 18aac1e4ef1e, as Debian 10 (Buster) shipped it.
squishy transparent oil and bubble screenhack
Flags it lists
-
-additive -
-count -
-delay -
-fps -
-install -
-mono -
-non-transparent -
-planes -
-root -
-subtractive -
-transparent -
-visual -
-window -
-xor