Magic plot, plotting and fitting software.
You can get an overview of the major features on here: magicplot web site .
First feature that makes this software noteworthy is that it is cross platform (win, osx, unix like).
It seems to produce very good quality graphs, and offers some unique management feature of traces in the graph window (i.e. you click on a trace, and it's highlighted with a green halo and the relevant legend entry is highlighted too.)
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Screenshot of main interface with simple plotting going on.
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