Conclusion

This task made me "visit" numerical objects web sites. One software, Diffpack, came out this search ; it seems to be very interresting and its relevance could be study in a next task.

Moreover, during this task I tried to find an html-editor running under Unix platforms and freely downlaodable. The following web sites could be explored :

http://web.canlink.com/helpdesk/unix.html
http://www.w3.org/TR/