WMScript allows to specify a command and have the numeric result
of that command displayed in the dock app's window. Up to 5 things
to monitor, the interval is configurable.
http://freshmeat.sourceforge.net/projects/wmscript
Submitted by Igor Pokrovsky <ip@unixway.org> (new maintainer) in PR 253346
Tested on Poudriere (amd64, i386). 'portlint -AC' is fine.