Similar to Origin or SigmaPlot, QtiPlot can be used to present 2D and 3D data and has various data analysis functions like curve fitting. Plotting of 3D data can be rendered using OpenGL using the Qwt3D libraries. It is a full-featured data analysis and plotting package available on Linux, Windows and Mac OS X platforms that supports python scripting.

WWW: http://www.qtiplot.com/
