Inspired by CY's physical constants package, I wrote a
(or another) Maxima package for dimensional analysis.
A demonstration may be viewed at (57K pdf file)
http://www.unk.edu/acad/math/people/willisb/dim-dem.pdf
and the source code may be downloaded from (an 8K uncompressed file)
http://www.unk.edu/acad/math/people/willisb/dimension.mac
My code differs greatly from the dimensional analysis code that
is currently a part of Maxima. If you have any opinions about my
code, let me know.
Regards,
Barton