Preferably one that connects points with lines? Excel does a good job in 2-D scatter plots; not 3D. Preferably for windows XP. P.S. An example would be plotting lorentz attractor in 3D space. http://www.ph.biu.ac.il/~rapaport/java-apps/lorenz.html something like this, but where you can enter your own data tables and plot. (P.S. although I believe mathematica can do it, I'm looking for something more specific, just like above with ability to enter your own data tables). TIA.