Hello Jo,
> I am wondering how to compute calculations over
> network with maxima.
There are various user interfaces for Maxima.
Some are listed here: http://maxima.sourceforge.net/relatedprojects.shtml
In particular http://www.et.byu.edu/~koj/maxima.html
seems work pretty well.
So far as I know, all existing graphical interfaces talk to
a separately-running Maxima session via a socket.
It is probably possible to put the Maxima session and
the graphical interface on separate machines, although
I don't know the details about that.
If you would like to work on a graphical interface,
I'll bet the WxMaxima project (link on the "related projects"
page cited above) can use some help.
Thanks for your interest in Maxima,
Robert Dodier