And, you, as a moderator, in keeping with the ethical principles of the forum, would probably not give me, a worm, a hint as to where such discrete and ignoble websites may be found?wink wink, grin grin, say-no-more?
I'm looking for Maple, Sigma-Plot,etc........
Or would you?
LaTeX - MikTeX, WinEd, GhostView GhostScript
any number of graph plotters
(You can get most of these in no-install versions which will not modify the registry and will run off of a pendrive - at the cost of longer boot times)
CaptainBlack has made a very good point about open source software, not only is a lot cheaper, in a lot of cases it is as good as the best paid alternative.