https://sourceforge.net/projects/libxosd/
https://ignavus.net/xosd
Transparent X on-screen display.
It’s fairly insane. It’s way too unix-like to be usable by mere mortals. You’d think that you could run ‘xosd’ to run the program, but you’re wrong. It’s actually osd_cat ..
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Comes with an XMMS plugin.
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2007-07-17 – (version unknown) on Lubuntu (version not recorded)
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2007-07-17 – (version unknown) ∞
\echo "foo" | \osd_cat \echo "test" | \osd_cat --font "-misc-fixed-medium-r-semicondensed--*-*-*-*-c-*-*-*)" -d 1 \tail -f /var/log/messages | \osd_cat

Those notes are actually from 2007.