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Glove provides an interface to data acquisition systems, sophisticated (and correct) statistical analysis, a plotting tool, and the ability to easily manipulate the data. Its modular design allows plug-ins for acquisition, manipulation, and analysis.
ChangeLog: http://glove.sourceforge.net/ChangeLog.html
ZeGrapher is a free and open source software for plotting mathematical objects (functions, sequences, parametric equations) and experimental data on the plane. This software is intended to be as easy to use as possible, suitable for high school students.