ppmshadow(1) on Linux
The text 95c7d3b77cea, as Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge), Debian 3.0 (Woody) shipped it.
add simulated shadows to a portable pixmap image
Flags it lists
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-k -
-t -
-u