> Thank you for your note. In fact, I missed Maxima because I
> haven't found any copyright information that time (about a
> year ago). Is there any?
To follow your format in
http://wmi.math.u-szeged.hu/wmi/wmi.php?menu=About&cas=maple&formatted_l
ength=60&formatted_bgcolor=fefaf2&output_format=dvi&tex_density=100&lang
uage_code=de_DE&test_input_boxes=on&test_timer=off&wmilogo=yes&wmiauthor
s=yes (do you really need to use such long URLs?):
Maxima C 1976-2001 Massachusetts Institute of Technology and other
contributors