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thplot is a program for plotting numerical data.  It aims to be quick, both in terms of program response and the amount of user interaction required to get data displayed.  

My own need for this app grew out of my work on FlightGear and JSBSim.

It is written in C++ using fltk 1.1 and OpenGL and is known to work under both Linux and Windows with Cygwin.  fltk supports most Unices, Windows (MSVC, Cygwin, and MinGW),
and MacOS.  OpenGL does, of course, run darn near anywhere.

You can get thplot here and fltk 1.1 here.  As for getting OpenGL to work on your system, the FlightGear project has put together a guide on the subject in Appendix B of their Installation and Getting Guide.