Blender - Blender is the open source, cross platform suite of tools for 3D creation.
GraphPad Prism - Overview. GraphPad Prism, available for both Windows and Mac computers, combines scientific graphing, comprehensive curve fitting (nonlinear regression), understandable statistics, and data organization.
FreeCAD - An open-source parametric 3D modeler
OriginLab - OriginLab is a data analysis tool that provide the engineers and scientist with the technical charts and system for 2D and 3D plotting and all kind of fitting including curve and peak fitting.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.